31708 has 6 divisors (see below), whose sum is σ = 55496. Its totient is φ = 15852.

The previous prime is 31699. The next prime is 31721. The reversal of 31708 is 80713.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3960 + ... + 3967.

2³¹⁷⁰⁸ is an apocalyptic number.

It is an amenable number.

31708 is a deficient number, since it is larger than the sum of its proper divisors (23788).

31708 is a wasteful number, since it uses less digits than its factorization.

31708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7931 (or 7929 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 19.

The square root of 31708 is about 178.0674029687. The cubic root of 31708 is about 31.6511589196.

It can be divided in two parts, 3 and 1708, that added together give a triangular number (1711 = T₅₈).

The spelling of 31708 in words is "thirty-one thousand, seven hundred eight".