31200042400 has 36 divisors (see below), whose sum is σ = 76167105462. Its totient is φ = 12480016640.

The previous prime is 31200042373. The next prime is 31200042403. The reversal of 31200042400 is 424000213.

It can be written as a sum of positive squares in 3 ways, for example, as 16464995856 + 14735046544 = 128316^2 + 121388^2 .

It is a Harshad number since it is a multiple of its sum of digits (16).

It is not an unprimeable number, because it can be changed into a prime (31200042403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19499227 + ... + 19500826.

Almost surely, 2^31200042400 is an apocalyptic number.

It is an amenable number.

31200042400 is an abundant number, since it is smaller than the sum of its proper divisors (44967063062).

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

31200042400 is a wasteful number, since it uses less digits than its factorization.

31200042400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39000073 (or 39000060 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

Adding to 31200042400 its reverse (424000213), we get a palindrome (31624042613).

The spelling of 31200042400 in words is "thirty-one billion, two hundred million, forty-two thousand, four hundred".