684937897 has 16 divisors (see below), whose sum is σ = 825932800. Its totient is φ = 554875920.

The previous prime is 684937889. The next prime is 684937937. The reversal of 684937897 is 798739486.

It is a cyclic number.

It is not a de Polignac number, because 684937897 - 2³ = 684937889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (684937697) 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, 52522 + ... + 64252.

It is an arithmetic number, because the mean of its divisors is an integer number (51620800).

Almost surely, 2^684937897 is an apocalyptic number.

It is an amenable number.

684937897 is a deficient number, since it is larger than the sum of its proper divisors (140994903).

684937897 is a wasteful number, since it uses less digits than its factorization.

684937897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12196.

The product of its digits is 18289152, while the sum is 61.

The square root of 684937897 is about 26171.3182128834. The cubic root of 684937897 is about 881.4893413452.

The spelling of 684937897 in words is "six hundred eighty-four million, nine hundred thirty-seven thousand, eight hundred ninety-seven".