31400231440 has 40 divisors (see below), whose sum is σ = 76847938560. Its totient is φ = 11899034496.

The previous prime is 31400231437. The next prime is 31400231501. The reversal of 31400231440 is 4413200413.

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10327504 + ... + 10330543.

It is an arithmetic number, because the mean of its divisors is an integer number (1921198464).

Almost surely, 2^31400231440 is an apocalyptic number.

It is an amenable number.

31400231440 is an abundant number, since it is smaller than the sum of its proper divisors (45447707120).

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

31400231440 is a wasteful number, since it uses less digits than its factorization.

31400231440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20658079 (or 20658073 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

Adding to 31400231440 its reverse (4413200413), we get a palindrome (35813431853).

The spelling of 31400231440 in words is "thirty-one billion, four hundred million, two hundred thirty-one thousand, four hundred forty".