872138805 has 16 divisors (see below), whose sum is σ = 1401416640. Its totient is φ = 463142528.

The previous prime is 872138759. The next prime is 872138807. The reversal of 872138805 is 508831278.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 872138805 - 2¹¹ = 872136757 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872138807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121275 + ... + 128264.

It is an arithmetic number, because the mean of its divisors is an integer number (87588540).

Almost surely, 2^872138805 is an apocalyptic number.

It is an amenable number.

872138805 is a deficient number, since it is larger than the sum of its proper divisors (529277835).

872138805 is a wasteful number, since it uses less digits than its factorization.

872138805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249780.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 872138805 is about 29531.9962921574. The cubic root of 872138805 is about 955.4219255299.

The spelling of 872138805 in words is "eight hundred seventy-two million, one hundred thirty-eight thousand, eight hundred five".