872390409 has 16 divisors (see below), whose sum is σ = 1273999104. Its totient is φ = 526610000.

The previous prime is 872390401. The next prime is 872390413. The reversal of 872390409 is 904093278.

It is a cyclic number.

It is not a de Polignac number, because 872390409 - 2³ = 872390401 is a prime.

It is a super-2 number, since 2×872390409² = 1522130051430374562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (872390401) 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, 44379 + ... + 60944.

It is an arithmetic number, because the mean of its divisors is an integer number (79624944).

Almost surely, 2^872390409 is an apocalyptic number.

It is an amenable number.

872390409 is a deficient number, since it is larger than the sum of its proper divisors (401608695).

872390409 is a wasteful number, since it uses less digits than its factorization.

872390409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105588.

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 872390409 is about 29536.2558392224. The cubic root of 872390409 is about 955.5137935001.

The spelling of 872390409 in words is "eight hundred seventy-two million, three hundred ninety thousand, four hundred nine".