861877347 has 32 divisors (see below), whose sum is σ = 1193187840. Its totient is φ = 553132800.

The previous prime is 861877343. The next prime is 861877363. The reversal of 861877347 is 743778168.

It is not a de Polignac number, because 861877347 - 2² = 861877343 is a prime.

It is a super-2 number, since 2×861877347² = 1485665122543516818, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 861877347.

It is not an unprimeable number, because it can be changed into a prime (861877343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2215429 + ... + 2215817.

It is an arithmetic number, because the mean of its divisors is an integer number (37287120).

Almost surely, 2^861877347 is an apocalyptic number.

861877347 is a deficient number, since it is larger than the sum of its proper divisors (331310493).

861877347 is a wasteful number, since it uses less digits than its factorization.

861877347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 683.

The product of its digits is 1580544, while the sum is 51.

The square root of 861877347 is about 29357.7476486191. The cubic root of 861877347 is about 951.6600143416.

The spelling of 861877347 in words is "eight hundred sixty-one million, eight hundred seventy-seven thousand, three hundred forty-seven".