31401230240 has 48 divisors (see below), whose sum is σ = 77410867968. Its totient is φ = 12014382336.

The previous prime is 31401230227. The next prime is 31401230249. The reversal of 31401230240 is 4203210413.

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

It is not an unprimeable number, because it can be changed into a prime (31401230249) 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, 4262792 + ... + 4270151.

It is an arithmetic number, because the mean of its divisors is an integer number (1612726416).

Almost surely, 2^31401230240 is an apocalyptic number.

It is an amenable number.

31401230240 is an abundant number, since it is smaller than the sum of its proper divisors (46009637728).

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

31401230240 is a wasteful number, since it uses less digits than its factorization.

31401230240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8532981 (or 8532973 counting only the distinct ones).

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

Adding to 31401230240 its reverse (4203210413), we get a palindrome (35604440653).

The spelling of 31401230240 in words is "thirty-one billion, four hundred one million, two hundred thirty thousand, two hundred forty".