915915 has 64 divisors (see below), whose sum is σ = 1999872. Its totient is φ = 345600.

The previous prime is 915911. The next prime is 915917. The reversal of 915915 is 519519.

It is not a de Polignac number, because 915915 - 2² = 915911 is a prime.

915915 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (915911) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 14985 + ... + 15045.

It is an arithmetic number, because the mean of its divisors is an integer number (31248).

2⁹¹⁵⁹¹⁵ is an apocalyptic number.

915915 is an abundant number, since it is smaller than the sum of its proper divisors (1083957).

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

915915 is a wasteful number, since it uses less digits than its factorization.

915915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100.

The product of its digits is 2025, while the sum is 30.

The square root of 915915 is about 957.0344821374. The cubic root of 915915 is about 97.1147188440.

It can be divided in two parts, 915 and 915, that added together give a triangular number (1830 = T₆₀).

The spelling of 915915 in words is "nine hundred fifteen thousand, nine hundred fifteen".