31877945 has 16 divisors (see below), whose sum is σ = 41929920. Its totient is φ = 23073600.

The previous prime is 31877927. The next prime is 31877971. The reversal of 31877945 is 54977813.

It is a de Polignac number, because none of the positive numbers 2^k-31877945 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 31877896 and 31877905.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11330 + ... + 13860.

It is an arithmetic number, because the mean of its divisors is an integer number (2620620).

Almost surely, 2^31877945 is an apocalyptic number.

It is an amenable number.

31877945 is a deficient number, since it is larger than the sum of its proper divisors (10051975).

31877945 is a wasteful number, since it uses less digits than its factorization.

31877945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2776.

The product of its digits is 211680, while the sum is 44.

The square root of 31877945 is about 5646.0557028779. The cubic root of 31877945 is about 317.0760497812.

The spelling of 31877945 in words is "thirty-one million, eight hundred seventy-seven thousand, nine hundred forty-five".