31023040 has 56 divisors (see below), whose sum is σ = 76443840. Its totient is φ = 11977728.

The previous prime is 31023037. The next prime is 31023053. The reversal of 31023040 is 4032013.

It is a self number, because there is not a number n which added to its sum of digits gives 31023040.

It is a congruent number.

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, 7609 + ... + 10951.

Almost surely, 2^31023040 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 31023040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38221920).

31023040 is an abundant number, since it is smaller than the sum of its proper divisors (45420800).

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

31023040 is a wasteful number, since it uses less digits than its factorization.

31023040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3389 (or 3379 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 31023040 is about 5569.8330316088. The cubic root of 31023040 is about 314.2158711388.

Adding to 31023040 its reverse (4032013), we get a palindrome (35055053).

The spelling of 31023040 in words is "thirty-one million, twenty-three thousand, forty".