31440212432 has 20 divisors (see below), whose sum is σ = 61518537636. Its totient is φ = 15564460800.

The previous prime is 31440212429. The next prime is 31440212537. The reversal of 31440212432 is 23421204413.

It can be written as a sum of positive squares in 2 ways, for example, as 24820111936 + 6620100496 = 157544^2 + 81364^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9726173 + ... + 9729404.

Almost surely, 2^31440212432 is an apocalyptic number.

It is an amenable number.

31440212432 is a deficient number, since it is larger than the sum of its proper divisors (30078325204).

31440212432 is a wasteful number, since it uses less digits than its factorization.

31440212432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19455686 (or 19455680 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

Adding to 31440212432 its reverse (23421204413), we get a palindrome (54861416845).

The spelling of 31440212432 in words is "thirty-one billion, four hundred forty million, two hundred twelve thousand, four hundred thirty-two".