455 has 8 divisors (see below), whose sum is σ = 672. Its totient is φ = 288.

The previous prime is 449. The next prime is 457. The reversal of 455 is 554.

Subtracting from 455 its sum of digits (14), we obtain a square (441 = 21^{2}).

Adding to 455 its product of digits (100), we get a palindrome (555).

Subtracting 455 from its reverse (554), we obtain a palindrome (99).

It can be divided in two parts, 45 and 5, that multiplied together give a square (225 = 15^{2}).

455 = T_{1} + T_{2} + ... +
T_{13}.

455 is nontrivially palindromic in base 2, base 8 and base 9.

455 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

455 is a nontrivial binomial coefficient, being equal to C(15, 3).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 455 - 2^{4} = 439 is a prime.

455 is an undulating number in base 3 and base 8.

Its product of digits (100) is a multiple of the sum of its prime divisors (25).

455 is a nontrivial repdigit in base 9.

It is a plaindrome in base 9, base 10 and base 14.

It is a nialpdrome in base 5 and base 9.

It is a zygodrome in base 2 and base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (457) by changing a digit.

It is the 13-th tetrahedral number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29 + ... + 41.

It is an arithmetic number, because the mean of its divisors is an integer number (84).

455 is a deficient number, since it is larger than the sum of its proper divisors (217).

455 is a wasteful number, since it uses less digits than its factorization.

455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25.

The product of its digits is 100, while the sum is 14.

The square root of 455 is about 21.3307290077. The cubic root of 455 is about 7.6913716810.

The spelling of 455 in words is "four hundred fifty-five", and thus it is an aban number.

• e-mail: info -at- numbersaplenty.com • Privacy notice • done in 0.096 sec. • engine limits •