872922391 has 4 divisors (see below), whose sum is σ = 952278984. Its totient is φ = 793565800.

The previous prime is 872922373. The next prime is 872922419. The reversal of 872922391 is 193229278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 872922391 - 2¹⁵ = 872889623 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872922331) 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, 39678280 + ... + 39678301.

It is an arithmetic number, because the mean of its divisors is an integer number (238069746).

Almost surely, 2^872922391 is an apocalyptic number.

872922391 is a deficient number, since it is larger than the sum of its proper divisors (79356593).

872922391 is a wasteful number, since it uses less digits than its factorization.

872922391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79356592.

The product of its digits is 108864, while the sum is 43.

The square root of 872922391 is about 29545.2600428563. The cubic root of 872922391 is about 955.7079775280.

The spelling of 872922391 in words is "eight hundred seventy-two million, nine hundred twenty-two thousand, three hundred ninety-one".