15489864 has 144 divisors (see below), whose sum is σ = 48531600. Its totient is φ = 4447872.

The previous prime is 15489823. The next prime is 15489869. The reversal of 15489864 is 46898451.

15489864 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (15489869) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 231159 + ... + 231225.

It is an arithmetic number, because the mean of its divisors is an integer number (337025).

Almost surely, 2^15489864 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 15489864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24265800).

15489864 is an abundant number, since it is smaller than the sum of its proper divisors (33041736).

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

15489864 is a wasteful number, since it uses less digits than its factorization.

15489864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124 (or 104 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 15489864 is about 3935.7164532014. The cubic root of 15489864 is about 249.2771868453.

The spelling of 15489864 in words is "fifteen million, four hundred eighty-nine thousand, eight hundred sixty-four".