15406989 has 16 divisors (see below), whose sum is σ = 22193472. Its totient is φ = 9451008.

The previous prime is 15406961. The next prime is 15406991. The reversal of 15406989 is 98960451.

It is not a de Polignac number, because 15406989 - 2¹⁷ = 15275917 is a prime.

It is a super-2 number, since 2×15406989² = 474750620092242, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 15406989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15406999) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22557 + ... + 23229.

It is an arithmetic number, because the mean of its divisors is an integer number (1387092).

Almost surely, 2^15406989 is an apocalyptic number.

It is an amenable number.

15406989 is a deficient number, since it is larger than the sum of its proper divisors (6786483).

15406989 is a wasteful number, since it uses less digits than its factorization.

15406989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1276.

The product of its (nonzero) digits is 77760, while the sum is 42.

The square root of 15406989 is about 3925.1737541159. The cubic root of 15406989 is about 248.8318246340.

The spelling of 15406989 in words is "fifteen million, four hundred six thousand, nine hundred eighty-nine".