31380612 has 12 divisors (see below), whose sum is σ = 73221456. Its totient is φ = 10460200.

The previous prime is 31380607. The next prime is 31380653. The reversal of 31380612 is 21608313.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1307514 + ... + 1307537.

It is an arithmetic number, because the mean of its divisors is an integer number (6101788).

Almost surely, 2^31380612 is an apocalyptic number.

It is an amenable number.

31380612 is an abundant number, since it is smaller than the sum of its proper divisors (41840844).

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

31380612 is a wasteful number, since it uses less digits than its factorization.

31380612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2615058 (or 2615056 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 31380612 is about 5601.8400548391. The cubic root of 31380612 is about 315.4184813372.

Adding to 31380612 its reverse (21608313), we get a palindrome (52988925).

The spelling of 31380612 in words is "thirty-one million, three hundred eighty thousand, six hundred twelve".