15311231940 has 48 divisors (see below), whose sum is σ = 42914108160. Its totient is φ = 4078932480.

The previous prime is 15311231939. The next prime is 15311231941. The reversal of 15311231940 is 4913211351.

It is an interprime number because it is at equal distance from previous prime (15311231939) and next prime (15311231941).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 15311231898 and 15311231907.

It is not an unprimeable number, because it can be changed into a prime (15311231941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65916 + ... + 186995.

It is an arithmetic number, because the mean of its divisors is an integer number (894043920).

Almost surely, 2^15311231940 is an apocalyptic number.

15311231940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15311231940 is an abundant number, since it is smaller than the sum of its proper divisors (27602876220).

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

15311231940 is a wasteful number, since it uses less digits than its factorization.

15311231940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253932 (or 253930 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The spelling of 15311231940 in words is "fifteen billion, three hundred eleven million, two hundred thirty-one thousand, nine hundred forty".