400617431 has 4 divisors (see below), whose sum is σ = 404162832. Its totient is φ = 397072032.

The previous prime is 400617377. The next prime is 400617457. The reversal of 400617431 is 134716004.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-400617431 is a prime.

It is a super-2 number, since 2×400617431² = 320988652042079522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 400617431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400617491) 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, 1772531 + ... + 1772756.

It is an arithmetic number, because the mean of its divisors is an integer number (101040708).

Almost surely, 2^400617431 is an apocalyptic number.

400617431 is a deficient number, since it is larger than the sum of its proper divisors (3545401).

400617431 is a wasteful number, since it uses less digits than its factorization.

400617431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3545400.

The product of its (nonzero) digits is 2016, while the sum is 26.

The square root of 400617431 is about 20015.4298230140. The cubic root of 400617431 is about 737.1852107108.

The spelling of 400617431 in words is "four hundred million, six hundred seventeen thousand, four hundred thirty-one".