31979487 has 16 divisors (see below), whose sum is σ = 43936640. Its totient is φ = 20678112.

The previous prime is 31979473. The next prime is 31979509. The reversal of 31979487 is 78497913.

It is not a de Polignac number, because 31979487 - 2⁴ = 31979471 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31979447) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19464 + ... + 21042.

It is an arithmetic number, because the mean of its divisors is an integer number (2746040).

Almost surely, 2^31979487 is an apocalyptic number.

31979487 is a deficient number, since it is larger than the sum of its proper divisors (11957153).

31979487 is a wasteful number, since it uses less digits than its factorization.

31979487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782.

The product of its digits is 381024, while the sum is 48.

The square root of 31979487 is about 5655.0408486588. The cubic root of 31979487 is about 317.4123576476.

The spelling of 31979487 in words is "thirty-one million, nine hundred seventy-nine thousand, four hundred eighty-seven".