1915865 has 32 divisors (see below), whose sum is σ = 2872320. Its totient is φ = 1197504.

The previous prime is 1915853. The next prime is 1915891. The reversal of 1915865 is 5685191.

It is not a de Polignac number, because 1915865 - 2⁸ = 1915609 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

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, 28562 + ... + 28628.

It is an arithmetic number, because the mean of its divisors is an integer number (89760).

2^1915865 is an apocalyptic number.

It is an amenable number.

1915865 is a deficient number, since it is larger than the sum of its proper divisors (956455).

1915865 is a wasteful number, since it uses less digits than its factorization.

1915865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141.

The product of its digits is 10800, while the sum is 35.

The square root of 1915865 is about 1384.1477522288. The cubic root of 1915865 is about 124.2000110638.

The spelling of 1915865 in words is "one million, nine hundred fifteen thousand, eight hundred sixty-five".