15809391040 has 28 divisors (see below), whose sum is σ = 37646113176. Its totient is φ = 6323756288.

The previous prime is 15809391019. The next prime is 15809391083. The reversal of 15809391040 is 4019390851.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 15809390984 and 15809391002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24701854 + ... + 24702493.

It is an arithmetic number, because the mean of its divisors is an integer number (1344504042).

Almost surely, 2^15809391040 is an apocalyptic number.

15809391040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15809391040 is an abundant number, since it is smaller than the sum of its proper divisors (21836722136).

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

15809391040 is an equidigital number, since it uses as much as digits as its factorization.

15809391040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49404364 (or 49404354 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 15809391040 in words is "fifteen billion, eight hundred nine million, three hundred ninety-one thousand, forty".