15840923399 has 24 divisors (see below), whose sum is σ = 19039408128. Its totient is φ = 13127652720.

The previous prime is 15840923369. The next prime is 15840923407. The reversal of 15840923399 is 99332904851.

It is not a de Polignac number, because 15840923399 - 2²⁴ = 15824146183 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 15840923399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15840923359) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1853474 + ... + 1862000.

It is an arithmetic number, because the mean of its divisors is an integer number (793308672).

Almost surely, 2^15840923399 is an apocalyptic number.

15840923399 is a deficient number, since it is larger than the sum of its proper divisors (3198484729).

15840923399 is a wasteful number, since it uses less digits than its factorization.

15840923399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9795 (or 9788 counting only the distinct ones).

The product of its (nonzero) digits is 2099520, while the sum is 53.

The spelling of 15840923399 in words is "fifteen billion, eight hundred forty million, nine hundred twenty-three thousand, three hundred ninety-nine".