31404432 has 40 divisors (see below), whose sum is σ = 81691200. Its totient is φ = 10395520.

The previous prime is 31404431. The next prime is 31404437. The reversal of 31404432 is 23440413.

It is a junction number, because it is equal to n+sod(n) for n = 31404399 and 31404408.

It is not an unprimeable number, because it can be changed into a prime (31404431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4957 + ... + 9347.

It is an arithmetic number, because the mean of its divisors is an integer number (2042280).

Almost surely, 2^31404432 is an apocalyptic number.

It is an amenable number.

31404432 is an abundant number, since it is smaller than the sum of its proper divisors (50286768).

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

31404432 is a wasteful number, since it uses less digits than its factorization.

31404432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4551 (or 4545 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 31404432 is about 5603.9657386533. The cubic root of 31404432 is about 315.4982691161.

Adding to 31404432 its reverse (23440413), we get a palindrome (54844845).

The spelling of 31404432 in words is "thirty-one million, four hundred four thousand, four hundred thirty-two".