861399718 has 4 divisors (see below), whose sum is σ = 1292099580. Its totient is φ = 430699858.

The previous prime is 861399689. The next prime is 861399733. The reversal of 861399718 is 817993168.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 215349928 + ... + 215349931.

It is an arithmetic number, because the mean of its divisors is an integer number (323024895).

Almost surely, 2^861399718 is an apocalyptic number.

861399718 is a deficient number, since it is larger than the sum of its proper divisors (430699862).

861399718 is a wasteful number, since it uses less digits than its factorization.

861399718 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430699861.

The product of its digits is 653184, while the sum is 52.

The square root of 861399718 is about 29349.6118884049. The cubic root of 861399718 is about 951.4841871534.

The spelling of 861399718 in words is "eight hundred sixty-one million, three hundred ninety-nine thousand, seven hundred eighteen".