31026040 has 64 divisors (see below), whose sum is σ = 72990720. Its totient is φ = 11856000.

The previous prime is 31026029. The next prime is 31026043. The reversal of 31026040 is 4062013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31026043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162345 + ... + 162535.

It is an arithmetic number, because the mean of its divisors is an integer number (1140480).

Almost surely, 2^31026040 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 31026040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36495360).

31026040 is an abundant number, since it is smaller than the sum of its proper divisors (41964680).

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

31026040 is a wasteful number, since it uses less digits than its factorization.

31026040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364 (or 360 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 31026040 is about 5570.1023329917. The cubic root of 31026040 is about 314.2259992805.

Adding to 31026040 its reverse (4062013), we get a palindrome (35088053).

The spelling of 31026040 in words is "thirty-one million, twenty-six thousand, forty".