915840 has 128 divisors (see below), whose sum is σ = 3304800. Its totient is φ = 239616.

The previous prime is 915839. The next prime is 915851. The reversal of 915840 is 48519.

915840 is digitally balanced in base 2, because in such base 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 (128).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 915840.

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, 17254 + ... + 17306.

2⁹¹⁵⁸⁴⁰ is an apocalyptic number.

915840 is a gapful number since it is divisible by the number (90) 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 915840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1652400).

915840 is an abundant number, since it is smaller than the sum of its proper divisors (2388960).

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

915840 is a wasteful number, since it uses less digits than its factorization.

915840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 63 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 915840 is about 956.9952977941. The cubic root of 915840 is about 97.1120680148.

915840 divided by its product of nonzero digits (1440) gives a palindrome (636).

The spelling of 915840 in words is "nine hundred fifteen thousand, eight hundred forty".