31985986 has 16 divisors (see below), whose sum is σ = 50738688. Its totient is φ = 15098400.

The previous prime is 31985971. The next prime is 31986013. The reversal of 31985986 is 68958913.

31985986 = T₁₄₂₁ + T₁₄₂₂ + ... + T₁₄₅₁.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3750 + ... + 8833.

It is an arithmetic number, because the mean of its divisors is an integer number (3171168).

Almost surely, 2^31985986 is an apocalyptic number.

31985986 is a deficient number, since it is larger than the sum of its proper divisors (18752702).

31985986 is a wasteful number, since it uses less digits than its factorization.

31985986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12657.

The product of its digits is 466560, while the sum is 49.

The square root of 31985986 is about 5655.6154395433. The cubic root of 31985986 is about 317.4338581300.

The spelling of 31985986 in words is "thirty-one million, nine hundred eighty-five thousand, nine hundred eighty-six".