31143870438 has 32 divisors (see below), whose sum is σ = 62882788320. Its totient is φ = 10282187520.

The previous prime is 31143870431. The next prime is 31143870469. The reversal of 31143870438 is 83407834113.

It is a self number, because there is not a number n which added to its sum of digits gives 31143870438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31143870431) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 2122768 + ... + 2137388.

It is an arithmetic number, because the mean of its divisors is an integer number (1965087135).

Almost surely, 2^31143870438 is an apocalyptic number.

31143870438 is an abundant number, since it is smaller than the sum of its proper divisors (31738917882).

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

31143870438 is a wasteful number, since it uses less digits than its factorization.

31143870438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17992.

The product of its (nonzero) digits is 193536, while the sum is 42.

The spelling of 31143870438 in words is "thirty-one billion, one hundred forty-three million, eight hundred seventy thousand, four hundred thirty-eight".