31404312 has 24 divisors (see below), whose sum is σ = 85053540. Its totient is φ = 10468080.

The previous prime is 31404301. The next prime is 31404313. The reversal of 31404312 is 21340413.

It is a tau number, because it is divible by the number of its divisors (24).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31404313) 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 5 ways as a sum of consecutive naturals, for example, 218014 + ... + 218157.

Almost surely, 2^31404312 is an apocalyptic number.

It is an amenable number.

31404312 is an abundant number, since it is smaller than the sum of its proper divisors (53649228).

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

31404312 is a wasteful number, since it uses less digits than its factorization.

31404312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436183 (or 436176 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 31404312 is about 5603.9550319395. The cubic root of 31404312 is about 315.4978672637.

Adding to 31404312 its reverse (21340413), we get a palindrome (52744725).

The spelling of 31404312 in words is "thirty-one million, four hundred four thousand, three hundred twelve".