31389916 has 6 divisors (see below), whose sum is σ = 54932360. Its totient is φ = 15694956.

The previous prime is 31389907. The next prime is 31389923. The reversal of 31389916 is 61998313.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3923736 + ... + 3923743.

Almost surely, 2^31389916 is an apocalyptic number.

It is an amenable number.

31389916 is a deficient number, since it is larger than the sum of its proper divisors (23542444).

31389916 is a wasteful number, since it uses less digits than its factorization.

31389916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7847483 (or 7847481 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 31389916 is about 5602.6704347124. The cubic root of 31389916 is about 315.4496509393.

The spelling of 31389916 in words is "thirty-one million, three hundred eighty-nine thousand, nine hundred sixteen".