400323231 has 24 divisors (see below), whose sum is σ = 720929664. Its totient is φ = 207959760.

The previous prime is 400323223. The next prime is 400323241. The reversal of 400323231 is 132323004.

400323231 is a `hidden beast` number, since 400 + 3 + 232 + 31 = 666.

It is not a de Polignac number, because 400323231 - 2³ = 400323223 is a prime.

It is a super-2 number, since 2×400323231² = 320517378556558722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (400323241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 288141 + ... + 289526.

It is an arithmetic number, because the mean of its divisors is an integer number (30038736).

Almost surely, 2^400323231 is an apocalyptic number.

400323231 is a deficient number, since it is larger than the sum of its proper divisors (320606433).

400323231 is a wasteful number, since it uses less digits than its factorization.

400323231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577691 (or 577688 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 400323231 is about 20008.0791431861. The cubic root of 400323231 is about 737.0047118244.

Adding to 400323231 its reverse (132323004), we get a palindrome (532646235).

The spelling of 400323231 in words is "four hundred million, three hundred twenty-three thousand, two hundred thirty-one".