15723157989 has 32 divisors (see below), whose sum is σ = 27512847360. Its totient is φ = 7737984000.

The previous prime is 15723157981. The next prime is 15723157993. The reversal of 15723157989 is 98975132751.

It is not a de Polignac number, because 15723157989 - 2³ = 15723157981 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15723157981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1786812 + ... + 1795589.

It is an arithmetic number, because the mean of its divisors is an integer number (859776480).

Almost surely, 2^15723157989 is an apocalyptic number.

15723157989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

15723157989 is a deficient number, since it is larger than the sum of its proper divisors (11789689371).

15723157989 is a wasteful number, since it uses less digits than its factorization.

15723157989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3582441.

The product of its digits is 4762800, while the sum is 57.

The spelling of 15723157989 in words is "fifteen billion, seven hundred twenty-three million, one hundred fifty-seven thousand, nine hundred eighty-nine".