31977427 has 4 divisors (see below), whose sum is σ = 32081896. Its totient is φ = 31872960.

The previous prime is 31977409. The next prime is 31977443. The reversal of 31977427 is 72477913.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72477913 = 19 ⋅3814627.

It is a cyclic number.

It is not a de Polignac number, because 31977427 - 2⁷ = 31977299 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31977427.

It is not an unprimeable number, because it can be changed into a prime (31977487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51774 + ... + 52387.

It is an arithmetic number, because the mean of its divisors is an integer number (8020474).

Almost surely, 2^31977427 is an apocalyptic number.

31977427 is a deficient number, since it is larger than the sum of its proper divisors (104469).

31977427 is a wasteful number, since it uses less digits than its factorization.

31977427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104468.

The product of its digits is 74088, while the sum is 40.

The square root of 31977427 is about 5654.8587073419. The cubic root of 31977427 is about 317.4055419921.

The spelling of 31977427 in words is "thirty-one million, nine hundred seventy-seven thousand, four hundred twenty-seven".