400672057 has 4 divisors (see below), whose sum is σ = 421760080. Its totient is φ = 379584036.

The previous prime is 400672043. The next prime is 400672061. The reversal of 400672057 is 750276004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400672057 is a prime.

It is a super-2 number, since 2×400672057² = 321076194521222498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400670057) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10543983 + ... + 10544020.

It is an arithmetic number, because the mean of its divisors is an integer number (105440020).

Almost surely, 2^400672057 is an apocalyptic number.

It is an amenable number.

400672057 is a deficient number, since it is larger than the sum of its proper divisors (21088023).

400672057 is a wasteful number, since it uses less digits than its factorization.

400672057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21088022.

The product of its (nonzero) digits is 11760, while the sum is 31.

The square root of 400672057 is about 20016.7943737253. The cubic root of 400672057 is about 737.2187153680.

It can be divided in two parts, 40067 and 2057, that added together give a palindrome (42124).

The spelling of 400672057 in words is "four hundred million, six hundred seventy-two thousand, fifty-seven".