872619409 has 4 divisors (see below), whose sum is σ = 874644480. Its totient is φ = 870594340.

The previous prime is 872619361. The next prime is 872619467. The reversal of 872619409 is 904916278.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-872619409 is a prime.

It is a super-2 number, since 2×872619409² = 1522929265927018562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872611409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1011889 + ... + 1012750.

It is an arithmetic number, because the mean of its divisors is an integer number (218661120).

Almost surely, 2^872619409 is an apocalyptic number.

It is an amenable number.

872619409 is a deficient number, since it is larger than the sum of its proper divisors (2025071).

872619409 is a wasteful number, since it uses less digits than its factorization.

872619409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2025070.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 872619409 is about 29540.1321764138. The cubic root of 872619409 is about 955.5973927363.

The spelling of 872619409 in words is "eight hundred seventy-two million, six hundred nineteen thousand, four hundred nine".