15999239940 has 48 divisors (see below), whose sum is σ = 47155657920. Its totient is φ = 4041912960.

The previous prime is 15999239933. The next prime is 15999239969. The reversal of 15999239940 is 4993299951.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7016071 + ... + 7018350.

It is an arithmetic number, because the mean of its divisors is an integer number (982409540).

Almost surely, 2^15999239940 is an apocalyptic number.

15999239940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15999239940 is an abundant number, since it is smaller than the sum of its proper divisors (31156417980).

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

15999239940 is a wasteful number, since it uses less digits than its factorization.

15999239940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14034452 (or 14034450 counting only the distinct ones).

The product of its (nonzero) digits is 7085880, while the sum is 60.

The spelling of 15999239940 in words is "fifteen billion, nine hundred ninety-nine million, two hundred thirty-nine thousand, nine hundred forty".