15900240 has 80 divisors (see below), whose sum is σ = 49871808. Its totient is φ = 4190208.

The previous prime is 15900233. The next prime is 15900259. The reversal of 15900240 is 4200951.

15900240 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 a tau number, because it is divible by the number of its divisors (80).

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, 22939 + ... + 23621.

Almost surely, 2^15900240 is an apocalyptic number.

15900240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15900240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24935904).

15900240 is an abundant number, since it is smaller than the sum of its proper divisors (33971568).

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

15900240 is a wasteful number, since it uses less digits than its factorization.

15900240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 15900240 is about 3987.5105015536. The cubic root of 15900240 is about 251.4594105718.

The spelling of 15900240 in words is "fifteen million, nine hundred thousand, two hundred forty".