31390977 has 8 divisors (see below), whose sum is σ = 42030720. Its totient is φ = 20839280.

The previous prime is 31390969. The next prime is 31390979. The reversal of 31390977 is 77909313.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 31390977 - 2³ = 31390969 is a prime.

It is not an unprimeable number, because it can be changed into a prime (31390979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21174 + ... + 22607.

It is an arithmetic number, because the mean of its divisors is an integer number (5253840).

Almost surely, 2^31390977 is an apocalyptic number.

It is an amenable number.

31390977 is a deficient number, since it is larger than the sum of its proper divisors (10639743).

31390977 is a wasteful number, since it uses less digits than its factorization.

31390977 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44023.

The product of its (nonzero) digits is 35721, while the sum is 39.

The square root of 31390977 is about 5602.7651209024. The cubic root of 31390977 is about 315.4532050351.

The spelling of 31390977 in words is "thirty-one million, three hundred ninety thousand, nine hundred seventy-seven".