42455 has 8 divisors (see below), whose sum is σ = 58272. Its totient is φ = 29088.

The previous prime is 42451. The next prime is 42457. The reversal of 42455 is 55424.

It is a happy number.

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 42455 - 2² = 42451 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 572 + ... + 641.

It is an arithmetic number, because the mean of its divisors is an integer number (7284).

2⁴²⁴⁵⁵ is an apocalyptic number.

42455 is a deficient number, since it is larger than the sum of its proper divisors (15817).

42455 is a wasteful number, since it uses less digits than its factorization.

42455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225.

The product of its digits is 800, while the sum is 20.

The square root of 42455 is about 206.0461113440. The cubic root of 42455 is about 34.8853390636.

Adding to 42455 its reverse (55424), we get a palindrome (97879).

It can be divided in two parts, 42 and 455, that multiplied together give a triangular number (19110 = T₁₉₅).

The spelling of 42455 in words is "forty-two thousand, four hundred fifty-five".