31297040 has 40 divisors (see below), whose sum is σ = 73864320. Its totient is φ = 12329856.

The previous prime is 31297037. The next prime is 31297099. The reversal of 31297040 is 4079213.

It is a tau number, because it is divible by the number of its divisors (40).

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, 2441 + ... + 8279.

It is an arithmetic number, because the mean of its divisors is an integer number (1846608).

Almost surely, 2^31297040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31297040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36932160).

31297040 is an abundant number, since it is smaller than the sum of its proper divisors (42567280).

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

31297040 is a wasteful number, since it uses less digits than its factorization.

31297040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5919 (or 5913 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 31297040 is about 5594.3757471232. The cubic root of 31297040 is about 315.1382277361.

The spelling of 31297040 in words is "thirty-one million, two hundred ninety-seven thousand, forty".