870409209 has 8 divisors (see below), whose sum is σ = 1221627040. Its totient is φ = 549732096.

The previous prime is 870409207. The next prime is 870409223. The reversal of 870409209 is 902904078.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 870409209 - 2¹ = 870409207 is a prime.

It is a super-2 number, since 2×870409209² = 1515224382224011362, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (870409207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7635112 + ... + 7635225.

It is an arithmetic number, because the mean of its divisors is an integer number (152703380).

Almost surely, 2^870409209 is an apocalyptic number.

It is an amenable number.

870409209 is a deficient number, since it is larger than the sum of its proper divisors (351217831).

870409209 is a wasteful number, since it uses less digits than its factorization.

870409209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15270359.

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 870409209 is about 29502.6983342202. The cubic root of 870409209 is about 954.7899208053.

The spelling of 870409209 in words is "eight hundred seventy million, four hundred nine thousand, two hundred nine".