872438123 has 4 divisors (see below), whose sum is σ = 879098088. Its totient is φ = 865778160.

The previous prime is 872438107. The next prime is 872438129. The reversal of 872438123 is 321834278.

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 872438123 - 2⁴ = 872438107 is a prime.

It is a super-2 number, since 2×872438123² = 1522296556927526258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (872438129) 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, 3329786 + ... + 3330047.

It is an arithmetic number, because the mean of its divisors is an integer number (219774522).

Almost surely, 2^872438123 is an apocalyptic number.

872438123 is a deficient number, since it is larger than the sum of its proper divisors (6659965).

872438123 is a wasteful number, since it uses less digits than its factorization.

872438123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6659964.

The product of its digits is 64512, while the sum is 38.

The square root of 872438123 is about 29537.0635473467. The cubic root of 872438123 is about 955.5312132828.

The spelling of 872438123 in words is "eight hundred seventy-two million, four hundred thirty-eight thousand, one hundred twenty-three".