400453 has 6 divisors (see below), whose sum is σ = 419174. Its totient is φ = 382536.

The previous prime is 400441. The next prime is 400457. The reversal of 400453 is 354004.

It can be written as a sum of positive squares in only one way, i.e., 357604 + 42849 = 598^2 + 207^2 .

It is not a de Polignac number, because 400453 - 2⁹ = 399941 is a prime.

It is a Duffinian number.

400453 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400457) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 151 + ... + 907.

2⁴⁰⁰⁴⁵³ is an apocalyptic number.

It is an amenable number.

400453 is a deficient number, since it is larger than the sum of its proper divisors (18721).

400453 is an equidigital number, since it uses as much as digits as its factorization.

400453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 803 (or 780 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 400453 is about 632.8135586411. The cubic root of 400453 is about 73.7084339173.

Adding to 400453 its reverse (354004), we get a palindrome (754457).

It can be divided in two parts, 4004 and 53, that multiplied together give a palindrome (212212).

The spelling of 400453 in words is "four hundred thousand, four hundred fifty-three".