872138711 has 4 divisors (see below), whose sum is σ = 873014472. Its totient is φ = 871262952.

The previous prime is 872138693. The next prime is 872138719. The reversal of 872138711 is 117831278.

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 872138711 - 2¹⁴ = 872122327 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 (872138719) 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, 436385 + ... + 438378.

It is an arithmetic number, because the mean of its divisors is an integer number (218253618).

Almost surely, 2^872138711 is an apocalyptic number.

872138711 is a deficient number, since it is larger than the sum of its proper divisors (875761).

872138711 is an equidigital number, since it uses as much as digits as its factorization.

872138711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875760.

The product of its digits is 18816, while the sum is 38.

The square root of 872138711 is about 29531.9947006632. The cubic root of 872138711 is about 955.4218912045.

Adding to 872138711 its reverse (117831278), we get a palindrome (989969989).

The spelling of 872138711 in words is "eight hundred seventy-two million, one hundred thirty-eight thousand, seven hundred eleven".