861791402 has 8 divisors (see below), whose sum is σ = 1293811716. Its totient is φ = 430520832.

The previous prime is 861791401. The next prime is 861791429. The reversal of 861791402 is 204197168.

It can be written as a sum of positive squares in 2 ways, for example, as 839898361 + 21893041 = 28981^2 + 4679^2 .

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

It is a super-2 number, since 2×861791402² = 1485368841122251208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (861791401) 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 3 ways as a sum of consecutive naturals, for example, 184553 + ... + 189164.

Almost surely, 2^861791402 is an apocalyptic number.

861791402 is a deficient number, since it is larger than the sum of its proper divisors (432020314).

861791402 is a wasteful number, since it uses less digits than its factorization.

861791402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 374872.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 861791402 is about 29356.2838588265. The cubic root of 861791402 is about 951.6283806298.

The spelling of 861791402 in words is "eight hundred sixty-one million, seven hundred ninety-one thousand, four hundred two".