15742989 has 6 divisors (see below), whose sum is σ = 22739886. Its totient is φ = 10495320.

The previous prime is 15742973. The next prime is 15742997. The reversal of 15742989 is 98924751.

It can be written as a sum of positive squares in only one way, i.e., 14402025 + 1340964 = 3795^2 + 1158^2 .

It is not a de Polignac number, because 15742989 - 2⁴ = 15742973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15742919) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 874602 + ... + 874619.

It is an arithmetic number, because the mean of its divisors is an integer number (3789981).

Almost surely, 2^15742989 is an apocalyptic number.

It is an amenable number.

15742989 is a deficient number, since it is larger than the sum of its proper divisors (6996897).

15742989 is a wasteful number, since it uses less digits than its factorization.

15742989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749227 (or 1749224 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 15742989 is about 3967.7435653026. The cubic root of 15742989 is about 250.6276973319.

The spelling of 15742989 in words is "fifteen million, seven hundred forty-two thousand, nine hundred eighty-nine".