685993942 has 4 divisors (see below), whose sum is σ = 1028990916. Its totient is φ = 342996970.

The previous prime is 685993907. The next prime is 685993961. The reversal of 685993942 is 249399586.

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, 171498484 + ... + 171498487.

It is an arithmetic number, because the mean of its divisors is an integer number (257247729).

Almost surely, 2^685993942 is an apocalyptic number.

685993942 is a deficient number, since it is larger than the sum of its proper divisors (342996974).

685993942 is a wasteful number, since it uses less digits than its factorization.

685993942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342996973.

The product of its digits is 4199040, while the sum is 55.

The square root of 685993942 is about 26191.4860594049. The cubic root of 685993942 is about 881.9421387957.

The spelling of 685993942 in words is "six hundred eighty-five million, nine hundred ninety-three thousand, nine hundred forty-two".