15398661 has 24 divisors (see below), whose sum is σ = 22226176. Its totient is φ = 9472320.

The previous prime is 15398659. The next prime is 15398671. The reversal of 15398661 is 16689351.

It is not a de Polignac number, because 15398661 - 2¹ = 15398659 is a prime.

It is a super-3 number, since 3×15398661³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15398671) 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, 49041 + ... + 49353.

Almost surely, 2^15398661 is an apocalyptic number.

It is an amenable number.

15398661 is a deficient number, since it is larger than the sum of its proper divisors (6827515).

15398661 is a wasteful number, since it uses less digits than its factorization.

15398661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 393 (or 370 counting only the distinct ones).

The product of its digits is 38880, while the sum is 39.

The square root of 15398661 is about 3924.1127659638. The cubic root of 15398661 is about 248.7869825404.

The spelling of 15398661 in words is "fifteen million, three hundred ninety-eight thousand, six hundred sixty-one".