31163940 has 60 divisors (see below), whose sum is σ = 97767516. Its totient is φ = 8309952.

The previous prime is 31163921. The next prime is 31163969. The reversal of 31163940 is 4936113.

It can be written as a sum of positive squares in 2 ways, for example, as 7193124 + 23970816 = 2682^2 + 4896^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7999 + ... + 11238.

Almost surely, 2^31163940 is an apocalyptic number.

31163940 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31163940 is an abundant number, since it is smaller than the sum of its proper divisors (66603576).

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

31163940 is a wasteful number, since it uses less digits than its factorization.

31163940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19258 (or 19247 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 31163940 is about 5582.4671965001. The cubic root of 31163940 is about 314.6908531594.

It can be divided in two parts, 3116 and 3940, that added together give a square (7056 = 84²).

The spelling of 31163940 in words is "thirty-one million, one hundred sixty-three thousand, nine hundred forty".