838872561 has 16 divisors (see below), whose sum is σ = 1139025600. Its totient is φ = 549010368.

The previous prime is 838872557. The next prime is 838872607. The reversal of 838872561 is 165278838.

It is not a de Polignac number, because 838872561 - 2² = 838872557 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 838872561.

It is not an unprimeable number, because it can be changed into a prime (838872511) 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, 143875 + ... + 149591.

It is an arithmetic number, because the mean of its divisors is an integer number (71189100).

Almost surely, 2^838872561 is an apocalyptic number.

It is an amenable number.

838872561 is a deficient number, since it is larger than the sum of its proper divisors (300153039).

838872561 is a wasteful number, since it uses less digits than its factorization.

838872561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6608.

The product of its digits is 645120, while the sum is 48.

The square root of 838872561 is about 28963.2967909387. The cubic root of 838872561 is about 943.1164711727.

The spelling of 838872561 in words is "eight hundred thirty-eight million, eight hundred seventy-two thousand, five hundred sixty-one".