684109897 has 16 divisors (see below), whose sum is σ = 705196800. Its totient is φ = 663420240.

The previous prime is 684109873. The next prime is 684109927. The reversal of 684109897 is 798901486.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 684109897 - 2¹⁵ = 684077129 is a prime.

It is a super-3 number, since 3×684109897³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (684109837) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2228218 + ... + 2228524.

It is an arithmetic number, because the mean of its divisors is an integer number (44074800).

Almost surely, 2^684109897 is an apocalyptic number.

It is an amenable number.

684109897 is a deficient number, since it is larger than the sum of its proper divisors (21086903).

684109897 is a wasteful number, since it uses less digits than its factorization.

684109897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 756.

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 684109897 is about 26155.4945852683. The cubic root of 684109897 is about 881.1339964871.

The spelling of 684109897 in words is "six hundred eighty-four million, one hundred nine thousand, eight hundred ninety-seven".