400077931 has 4 divisors (see below), whose sum is σ = 436448664. Its totient is φ = 363707200.

The previous prime is 400077917. The next prime is 400077947. The reversal of 400077931 is 139770004.

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 400077931 - 2⁷ = 400077803 is a prime.

It is a super-2 number, since 2×400077931² = 320124701746481522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 400077893 and 400077902.

It is not an unprimeable number, because it can be changed into a prime (400077901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18185350 + ... + 18185371.

It is an arithmetic number, because the mean of its divisors is an integer number (109112166).

Almost surely, 2^400077931 is an apocalyptic number.

400077931 is a deficient number, since it is larger than the sum of its proper divisors (36370733).

400077931 is a wasteful number, since it uses less digits than its factorization.

400077931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36370732.

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 400077931 is about 20001.9481801149. The cubic root of 400077931 is about 736.8541466640.

The spelling of 400077931 in words is "four hundred million, seventy-seven thousand, nine hundred thirty-one".