1165899 has 16 divisors (see below), whose sum is σ = 1808640. Its totient is φ = 654240.

The previous prime is 1165889. The next prime is 1165903. The reversal of 1165899 is 9985611.

It is not a de Polignac number, because 1165899 - 2⁸ = 1165643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1165819) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 769 + ... + 1709.

It is an arithmetic number, because the mean of its divisors is an integer number (113040).

2^1165899 is an apocalyptic number.

1165899 is a deficient number, since it is larger than the sum of its proper divisors (642741).

1165899 is an equidigital number, since it uses as much as digits as its factorization.

1165899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010.

The product of its digits is 19440, while the sum is 39.

The square root of 1165899 is about 1079.7680306436. The cubic root of 1165899 is about 105.2495650913.

The spelling of 1165899 in words is "one million, one hundred sixty-five thousand, eight hundred ninety-nine".