15801240 has 128 divisors (see below), whose sum is σ = 58383360. Its totient is φ = 3331584.

The previous prime is 15801223. The next prime is 15801271. The reversal of 15801240 is 4210851.

15801240 is digitally balanced in base 2, base 4 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (21).

15801240 is strictly pandigital in base 8.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10197 + ... + 11643.

It is an arithmetic number, because the mean of its divisors is an integer number (456120).

Almost surely, 2^15801240 is an apocalyptic number.

15801240 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 15801240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29191680).

15801240 is an abundant number, since it is smaller than the sum of its proper divisors (42582120).

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

15801240 is a wasteful number, since it uses less digits than its factorization.

15801240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1481 (or 1477 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 15801240 is about 3975.0773577378. The cubic root of 15801240 is about 250.9364346477.

The spelling of 15801240 in words is "fifteen million, eight hundred one thousand, two hundred forty".