405431232 has 56 divisors (see below), whose sum is σ = 1135812816. Its totient is φ = 127193088.

The previous prime is 405431207. The next prime is 405431233. The reversal of 405431232 is 232134504.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405431233) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58843 + ... + 65370.

Almost surely, 2^405431232 is an apocalyptic number.

It is an amenable number.

405431232 is an abundant number, since it is smaller than the sum of its proper divisors (730381584).

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

405431232 is a wasteful number, since it uses less digits than its factorization.

405431232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124245 (or 124235 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 405431232 is about 20135.3229921946. The cubic root of 405431232 is about 740.1261241075.

Adding to 405431232 its reverse (232134504), we get a palindrome (637565736).

The spelling of 405431232 in words is "four hundred five million, four hundred thirty-one thousand, two hundred thirty-two".