15398864 has 40 divisors (see below), whose sum is σ = 32492712. Its totient is φ = 7027200.

The previous prime is 15398861. The next prime is 15398893. The reversal of 15398864 is 46889351.

It can be written as a sum of positive squares in 4 ways, for example, as 8065600 + 7333264 = 2840^2 + 2708^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15398861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20642 + ... + 21374.

Almost surely, 2^15398864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15398864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16246356).

15398864 is an abundant number, since it is smaller than the sum of its proper divisors (17093848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

15398864 is a wasteful number, since it uses less digits than its factorization.

15398864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 855 (or 849 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The square root of 15398864 is about 3924.1386315980. The cubic root of 15398864 is about 248.7880757856.

The spelling of 15398864 in words is "fifteen million, three hundred ninety-eight thousand, eight hundred sixty-four".