15491868 has 48 divisors (see below), whose sum is σ = 42282240. Its totient is φ = 4322304.

The previous prime is 15491851. The next prime is 15491881. The reversal of 15491868 is 86819451.

15491868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1468 + ... + 5756.

It is an arithmetic number, because the mean of its divisors is an integer number (880880).

Almost surely, 2^15491868 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 15491868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21141120).

15491868 is an abundant number, since it is smaller than the sum of its proper divisors (26790372).

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

15491868 is a wasteful number, since it uses less digits than its factorization.

15491868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4346 (or 4344 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 15491868 is about 3935.9710364788. The cubic root of 15491868 is about 249.2879364542.

The spelling of 15491868 in words is "fifteen million, four hundred ninety-one thousand, eight hundred sixty-eight".