400051731 has 8 divisors (see below), whose sum is σ = 534635920. Its totient is φ = 266084352.

The previous prime is 400051727. The next prime is 400051741. The reversal of 400051731 is 137150004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 400051731 - 2² = 400051727 is a prime.

It is a super-2 number, since 2×400051731² = 320082774952192722, 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 = 400051698 and 400051707.

It is not an unprimeable number, because it can be changed into a prime (400051721) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152686 + ... + 155283.

It is an arithmetic number, because the mean of its divisors is an integer number (66829490).

Almost surely, 2^400051731 is an apocalyptic number.

400051731 is a deficient number, since it is larger than the sum of its proper divisors (134584189).

400051731 is a wasteful number, since it uses less digits than its factorization.

400051731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308405.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 400051731 is about 20001.2932331887. The cubic root of 400051731 is about 736.8380614645.

The spelling of 400051731 in words is "four hundred million, fifty-one thousand, seven hundred thirty-one".