400040331 has 4 divisors (see below), whose sum is σ = 533387112. Its totient is φ = 266693552.

The previous prime is 400040327. The next prime is 400040363. The reversal of 400040331 is 133040004.

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 400040331 - 2² = 400040327 is a prime.

It is a super-2 number, since 2×400040331² = 320064532853179122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 400040331.

It is not an unprimeable number, because it can be changed into a prime (400044331) 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, 66673386 + ... + 66673391.

It is an arithmetic number, because the mean of its divisors is an integer number (133346778).

Almost surely, 2^400040331 is an apocalyptic number.

400040331 is a deficient number, since it is larger than the sum of its proper divisors (133346781).

400040331 is a wasteful number, since it uses less digits than its factorization.

400040331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133346780.

The product of its (nonzero) digits is 144, while the sum is 15.

The square root of 400040331 is about 20001.0082495858. The cubic root of 400040331 is about 736.8310623416.

Adding to 400040331 its reverse (133040004), we get a palindrome (533080335).

The spelling of 400040331 in words is "four hundred million, forty thousand, three hundred thirty-one".