872124389 has 4 divisors (see below), whose sum is σ = 872190540. Its totient is φ = 872058240.

The previous prime is 872124329. The next prime is 872124391. The reversal of 872124389 is 983421278.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 760821889 + 111302500 = 27583^2 + 10550^2 .

It is a cyclic number.

It is not a de Polignac number, because 872124389 - 2²⁸ = 603688933 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 (872124329) 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, 5804 + ... + 42165.

It is an arithmetic number, because the mean of its divisors is an integer number (218047635).

Almost surely, 2^872124389 is an apocalyptic number.

It is an amenable number.

872124389 is a deficient number, since it is larger than the sum of its proper divisors (66151).

872124389 is a wasteful number, since it uses less digits than its factorization.

872124389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66150.

The product of its digits is 193536, while the sum is 44.

The square root of 872124389 is about 29531.7522168936. The cubic root of 872124389 is about 955.4166612921.

The spelling of 872124389 in words is "eight hundred seventy-two million, one hundred twenty-four thousand, three hundred eighty-nine".