872139385 has 8 divisors (see below), whose sum is σ = 1127072520. Its totient is φ = 644041344.

The previous prime is 872139383. The next prime is 872139403. The reversal of 872139385 is 583931278.

It can be written as a sum of positive squares in 4 ways, for example, as 129413376 + 742726009 = 11376^2 + 27253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 872139385 - 2¹ = 872139383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (872139383) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6708700 + ... + 6708829.

It is an arithmetic number, because the mean of its divisors is an integer number (140884065).

Almost surely, 2^872139385 is an apocalyptic number.

It is an amenable number.

872139385 is a deficient number, since it is larger than the sum of its proper divisors (254933135).

872139385 is a wasteful number, since it uses less digits than its factorization.

872139385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13417547.

The product of its digits is 362880, while the sum is 46.

The square root of 872139385 is about 29532.0061120135. The cubic root of 872139385 is about 955.4221373252.

The spelling of 872139385 in words is "eight hundred seventy-two million, one hundred thirty-nine thousand, three hundred eighty-five".