400553431 has 4 divisors (see below), whose sum is σ = 400896664. Its totient is φ = 400210200.

The previous prime is 400553407. The next prime is 400553437. The reversal of 400553431 is 134355004.

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 400553431 - 2²⁷ = 266335703 is a prime.

It is a super-2 number, since 2×400553431² = 320886102171743522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400553396 and 400553405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400553437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 169860 + ... + 172201.

It is an arithmetic number, because the mean of its divisors is an integer number (100224166).

Almost surely, 2^400553431 is an apocalyptic number.

400553431 is a deficient number, since it is larger than the sum of its proper divisors (343233).

400553431 is a wasteful number, since it uses less digits than its factorization.

400553431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343232.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 400553431 is about 20013.8309925911. The cubic root of 400553431 is about 737.1459526702.

The spelling of 400553431 in words is "four hundred million, five hundred fifty-three thousand, four hundred thirty-one".