31040540 has 24 divisors (see below), whose sum is σ = 65297232. Its totient is φ = 12394880.

The previous prime is 31040533. The next prime is 31040543. The reversal of 31040540 is 4504013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31040543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16235 + ... + 18045.

It is an arithmetic number, because the mean of its divisors is an integer number (2720718).

Almost surely, 2^31040540 is an apocalyptic number.

It is an amenable number.

31040540 is an abundant number, since it is smaller than the sum of its proper divisors (34256692).

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

31040540 is a wasteful number, since it uses less digits than its factorization.

31040540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2677 (or 2675 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 31040540 is about 5571.4037728386. The cubic root of 31040540 is about 314.2749427635.

Adding to 31040540 its reverse (4504013), we get a palindrome (35544553).

The spelling of 31040540 in words is "thirty-one million, forty thousand, five hundred forty".