31390377 has 16 divisors (see below), whose sum is σ = 43957248. Its totient is φ = 19887120.

The previous prime is 31390369. The next prime is 31390397. The reversal of 31390377 is 77309313.

It is not a de Polignac number, because 31390377 - 2³ = 31390369 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31390367) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 9852 + ... + 12642.

It is an arithmetic number, because the mean of its divisors is an integer number (2747328).

Almost surely, 2^31390377 is an apocalyptic number.

It is an amenable number.

31390377 is a deficient number, since it is larger than the sum of its proper divisors (12566871).

31390377 is a wasteful number, since it uses less digits than its factorization.

31390377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980.

The product of its (nonzero) digits is 11907, while the sum is 33.

The square root of 31390377 is about 5602.7115756569. The cubic root of 31390377 is about 315.4511951887.

The spelling of 31390377 in words is "thirty-one million, three hundred ninety thousand, three hundred seventy-seven".