31200030040 has 32 divisors (see below), whose sum is σ = 70425819360. Its totient is φ = 12439878400.

The previous prime is 31200030023. The next prime is 31200030047. The reversal of 31200030040 is 4003000213.

It is a self number, because there is not a number n which added to its sum of digits gives 31200030040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31200030047) 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, 1241581 + ... + 1266460.

It is an arithmetic number, because the mean of its divisors is an integer number (2200806855).

Almost surely, 2^31200030040 is an apocalyptic number.

It is an amenable number.

31200030040 is an abundant number, since it is smaller than the sum of its proper divisors (39225789320).

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

31200030040 is a wasteful number, since it uses less digits than its factorization.

31200030040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2508363 (or 2508359 counting only the distinct ones).

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

Adding to 31200030040 its reverse (4003000213), we get a palindrome (35203030253).

The spelling of 31200030040 in words is "thirty-one billion, two hundred million, thirty thousand, forty".