1642865 has 16 divisors (see below), whose sum is σ = 2287488. Its totient is φ = 1109376.

The previous prime is 1642859. The next prime is 1642903. The reversal of 1642865 is 5682461.

It is a cyclic number.

It is not a de Polignac number, because 1642865 - 2⁶ = 1642801 is a prime.

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, 2234 + ... + 2876.

It is an arithmetic number, because the mean of its divisors is an integer number (142968).

2^1642865 is an apocalyptic number.

It is an amenable number.

1642865 is a deficient number, since it is larger than the sum of its proper divisors (644623).

1642865 is an equidigital number, since it uses as much as digits as its factorization.

1642865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728.

The product of its digits is 11520, while the sum is 32.

The square root of 1642865 is about 1281.7429539498. The cubic root of 1642865 is about 117.9960019712.

The spelling of 1642865 in words is "one million, six hundred forty-two thousand, eight hundred sixty-five".