15311312040 has 128 divisors (see below), whose sum is σ = 46893945600. Its totient is φ = 3997992960.

The previous prime is 15311311999. The next prime is 15311312057. The reversal of 15311312040 is 4021311351.

It is a junction number, because it is equal to n+sod(n) for n = 15311311998 and 15311312016.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3616725 + ... + 3620955.

It is an arithmetic number, because the mean of its divisors is an integer number (366358950).

Almost surely, 2^15311312040 is an apocalyptic number.

15311312040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15311312040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23446972800).

15311312040 is an abundant number, since it is smaller than the sum of its proper divisors (31582633560).

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

15311312040 is a wasteful number, since it uses less digits than its factorization.

15311312040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4867 (or 4863 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

Adding to 15311312040 its reverse (4021311351), we get a palindrome (19332623391).

The spelling of 15311312040 in words is "fifteen billion, three hundred eleven million, three hundred twelve thousand, forty".