400894531 has 4 divisors (see below), whose sum is σ = 418324752. Its totient is φ = 383464312.

The previous prime is 400894523. The next prime is 400894607. The reversal of 400894531 is 135498004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 400894531 - 2³ = 400894523 is a prime.

It is a super-2 number, since 2×400894531² = 321432849971419922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400894831) 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, 8715076 + ... + 8715121.

It is an arithmetic number, because the mean of its divisors is an integer number (104581188).

Almost surely, 2^400894531 is an apocalyptic number.

400894531 is a deficient number, since it is larger than the sum of its proper divisors (17430221).

400894531 is a wasteful number, since it uses less digits than its factorization.

400894531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17430220.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 400894531 is about 20022.3507860591. The cubic root of 400894531 is about 737.3551375342.

The spelling of 400894531 in words is "four hundred million, eight hundred ninety-four thousand, five hundred thirty-one".