31402135240 has 128 divisors (see below), whose sum is σ = 85080326400. Its totient is φ = 10189946880.

The previous prime is 31402135231. The next prime is 31402135273. The reversal of 31402135240 is 4253120413.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7238352 + ... + 7242688.

It is an arithmetic number, because the mean of its divisors is an integer number (664690050).

Almost surely, 2^31402135240 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 31402135240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42540163200).

31402135240 is an abundant number, since it is smaller than the sum of its proper divisors (53678191160).

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

31402135240 is a wasteful number, since it uses less digits than its factorization.

31402135240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5735 (or 5731 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

Adding to 31402135240 its reverse (4253120413), we get a palindrome (35655255653).

The spelling of 31402135240 in words is "thirty-one billion, four hundred two million, one hundred thirty-five thousand, two hundred forty".