684866398 has 16 divisors (see below), whose sum is σ = 1046897280. Its totient is φ = 335930400.

The previous prime is 684866393. The next prime is 684866443. The reversal of 684866398 is 893668486.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684866393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40243 + ... + 54673.

It is an arithmetic number, because the mean of its divisors is an integer number (65431080).

Almost surely, 2^684866398 is an apocalyptic number.

684866398 is a deficient number, since it is larger than the sum of its proper divisors (362030882).

684866398 is a wasteful number, since it uses less digits than its factorization.

684866398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14883.

The product of its digits is 11943936, while the sum is 58.

The square root of 684866398 is about 26169.9521971287. The cubic root of 684866398 is about 881.4586681022.

The spelling of 684866398 in words is "six hundred eighty-four million, eight hundred sixty-six thousand, three hundred ninety-eight".