870909 has 16 divisors (see below), whose sum is σ = 1267392. Its totient is φ = 528768.

The previous prime is 870907. The next prime is 870911. The reversal of 870909 is 909078.

It is an interprime number because it is at equal distance from previous prime (870907) and next prime (870911).

It is not a de Polignac number, because 870909 - 2¹ = 870907 is a prime.

It is an alternating number because its digits alternate between even and odd.

870909 is a modest number, since divided by 909 gives 87 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 870909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (870901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5262 + ... + 5424.

It is an arithmetic number, because the mean of its divisors is an integer number (79212).

2⁸⁷⁰⁹⁰⁹ is an apocalyptic number.

It is an amenable number.

870909 is a deficient number, since it is larger than the sum of its proper divisors (396483).

870909 is a wasteful number, since it uses less digits than its factorization.

870909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 316.

The product of its (nonzero) digits is 4536, while the sum is 33.

The square root of 870909 is about 933.2250532428. The cubic root of 870909 is about 95.4972633372.

The spelling of 870909 in words is "eight hundred seventy thousand, nine hundred nine".