685990946 has 4 divisors (see below), whose sum is σ = 1028986422. Its totient is φ = 342995472.

The previous prime is 685990927. The next prime is 685990951. The reversal of 685990946 is 649099586.

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

It can be written as a sum of positive squares in only one way, i.e., 502252921 + 183738025 = 22411^2 + 13555^2 .

It is a junction number, because it is equal to n+sod(n) for n = 685990891 and 685990900.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 171497735 + ... + 171497738.

Almost surely, 2^685990946 is an apocalyptic number.

685990946 is a deficient number, since it is larger than the sum of its proper divisors (342995476).

685990946 is a wasteful number, since it uses less digits than its factorization.

685990946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342995475.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The square root of 685990946 is about 26191.4288651841. The cubic root of 685990946 is about 881.9408548668.

The spelling of 685990946 in words is "six hundred eighty-five million, nine hundred ninety thousand, nine hundred forty-six".