31985748 has 18 divisors (see below), whose sum is σ = 80852954. Its totient is φ = 10661904.

The previous prime is 31985747. The next prime is 31985749. The reversal of 31985748 is 84758913.

It is an interprime number because it is at equal distance from previous prime (31985747) and next prime (31985749).

It can be written as a sum of positive squares in only one way, i.e., 31674384 + 311364 = 5628^2 + 558^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a nialpdrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31985741) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 444211 + ... + 444282.

Almost surely, 2^31985748 is an apocalyptic number.

It is an amenable number.

31985748 is an abundant number, since it is smaller than the sum of its proper divisors (48867206).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31985748 is a wasteful number, since it uses less digits than its factorization.

31985748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 888503 (or 888498 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 31985748 is about 5655.5943984695. The cubic root of 31985748 is about 317.4330708118.

The spelling of 31985748 in words is "thirty-one million, nine hundred eighty-five thousand, seven hundred forty-eight".