400023432 has 48 divisors (see below), whose sum is σ = 1088880000. Its totient is φ = 132666336.

The previous prime is 400023431. The next prime is 400023461. The reversal of 400023432 is 234320004.

400023432 is a `hidden beast` number, since 400 + 0 + 234 + 32 = 666.

It is a super-2 number, since 2×400023432² = 320037492298117248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (400023431) 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 11 ways as a sum of consecutive naturals, for example, 369 + ... + 28287.

It is an arithmetic number, because the mean of its divisors is an integer number (22685000).

Almost surely, 2^400023432 is an apocalyptic number.

It is an amenable number.

400023432 is an abundant number, since it is smaller than the sum of its proper divisors (688856568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400023432 is a wasteful number, since it uses less digits than its factorization.

400023432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28130 (or 28123 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 400023432 is about 20000.5857914212. The cubic root of 400023432 is about 736.8206868182.

Adding to 400023432 its reverse (234320004), we get a palindrome (634343436).

It can be divided in two parts, 40002 and 3432, that added together give a palindrome (43434).

The spelling of 400023432 in words is "four hundred million, twenty-three thousand, four hundred thirty-two".