31423120400 has 120 divisors (see below), whose sum is σ = 86756988864. Its totient is φ = 10713945600.

The previous prime is 31423120373. The next prime is 31423120423. The reversal of 31423120400 is 402132413.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 475799 + ... + 537801.

Almost surely, 2^31423120400 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 31423120400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43378494432).

31423120400 is an abundant number, since it is smaller than the sum of its proper divisors (55333868464).

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

31423120400 is a wasteful number, since it uses less digits than its factorization.

31423120400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62209 (or 62198 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31423120400 its reverse (402132413), we get a palindrome (31825252813).

The spelling of 31423120400 in words is "thirty-one billion, four hundred twenty-three million, one hundred twenty thousand, four hundred".