31977405 has 12 divisors (see below), whose sum is σ = 55427580. Its totient is φ = 17054592.

The previous prime is 31977403. The next prime is 31977409. The reversal of 31977405 is 50477913.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 9566649 + 22410756 = 3093^2 + 4734^2 .

It is not a de Polignac number, because 31977405 - 2¹ = 31977403 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 31977405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31977403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355260 + ... + 355349.

It is an arithmetic number, because the mean of its divisors is an integer number (4618965).

Almost surely, 2^31977405 is an apocalyptic number.

It is an amenable number.

31977405 is a deficient number, since it is larger than the sum of its proper divisors (23450175).

31977405 is a wasteful number, since it uses less digits than its factorization.

31977405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710620 (or 710617 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 31977405 is about 5654.8567621117. The cubic root of 31977405 is about 317.4054692020.

The spelling of 31977405 in words is "thirty-one million, nine hundred seventy-seven thousand, four hundred five".