400231331 has 16 divisors (see below), whose sum is σ = 420380928. Its totient is φ = 380671200.

The previous prime is 400231327. The next prime is 400231339. The reversal of 400231331 is 133132004.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 400231331 - 2² = 400231327 is a prime.

It is a super-3 number, since 3×400231331³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (400231339) 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 15 ways as a sum of consecutive naturals, for example, 343556 + ... + 344718.

It is an arithmetic number, because the mean of its divisors is an integer number (26273808).

Almost surely, 2^400231331 is an apocalyptic number.

400231331 is a deficient number, since it is larger than the sum of its proper divisors (20149597).

400231331 is a wasteful number, since it uses less digits than its factorization.

400231331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1402.

The product of its (nonzero) digits is 216, while the sum is 17.

The square root of 400231331 is about 20005.7824390850. The cubic root of 400231331 is about 736.9483108037.

Adding to 400231331 its reverse (133132004), we get a palindrome (533363335).

The spelling of 400231331 in words is "four hundred million, two hundred thirty-one thousand, three hundred thirty-one".