684009946 has 8 divisors (see below), whose sum is σ = 1026152820. Its totient is φ = 341959008.

The previous prime is 684009913. The next prime is 684009961. The reversal of 684009946 is 649900486.

It can be written as a sum of positive squares in 2 ways, for example, as 496621225 + 187388721 = 22285^2 + 13689^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 684009896 and 684009905.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 360 + ... + 36988.

Almost surely, 2^684009946 is an apocalyptic number.

684009946 is a deficient number, since it is larger than the sum of its proper divisors (342142874).

684009946 is a wasteful number, since it uses less digits than its factorization.

684009946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45968.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 684009946 is about 26153.5838079602. The cubic root of 684009946 is about 881.0910820792.

The spelling of 684009946 in words is "six hundred eighty-four million, nine thousand, nine hundred forty-six".