31685746 has 4 divisors (see below), whose sum is σ = 47528622. Its totient is φ = 15842872.

The previous prime is 31685741. The next prime is 31685747. The reversal of 31685746 is 64758613.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 29822521 + 1863225 = 5461^2 + 1365^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 31685699 and 31685708.

It is not an unprimeable number, because it can be changed into a prime (31685741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7921435 + ... + 7921438.

Almost surely, 2^31685746 is an apocalyptic number.

31685746 is a deficient number, since it is larger than the sum of its proper divisors (15842876).

31685746 is a wasteful number, since it uses less digits than its factorization.

31685746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15842875.

The product of its digits is 120960, while the sum is 40.

The square root of 31685746 is about 5629.0093266933. The cubic root of 31685746 is about 316.4375248441.

The spelling of 31685746 in words is "thirty-one million, six hundred eighty-five thousand, seven hundred forty-six".