861992340442 has 8 divisors (see below), whose sum is σ = 1361040537600. Its totient is φ = 408312161244.

The previous prime is 861992340431. The next prime is 861992340463. The reversal of 861992340442 is 244043299168.

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

It is a self number, because there is not a number n which added to its sum of digits gives 861992340442.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11342004442 + ... + 11342004517.

It is an arithmetic number, because the mean of its divisors is an integer number (170130067200).

Almost surely, 2^861992340442 is an apocalyptic number.

861992340442 is a deficient number, since it is larger than the sum of its proper divisors (499048197158).

861992340442 is a wasteful number, since it uses less digits than its factorization.

861992340442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22684008980.

The product of its (nonzero) digits is 2985984, while the sum is 52.

The spelling of 861992340442 in words is "eight hundred sixty-one billion, nine hundred ninety-two million, three hundred forty thousand, four hundred forty-two".