684590397 has 4 divisors (see below), whose sum is σ = 912787200. Its totient is φ = 456393596.

The previous prime is 684590371. The next prime is 684590441. The reversal of 684590397 is 793095486.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 684590397 - 2⁸ = 684590141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684590497) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114098397 + ... + 114098402.

It is an arithmetic number, because the mean of its divisors is an integer number (228196800).

Almost surely, 2^684590397 is an apocalyptic number.

It is an amenable number.

684590397 is a deficient number, since it is larger than the sum of its proper divisors (228196803).

684590397 is a wasteful number, since it uses less digits than its factorization.

684590397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228196802.

The product of its (nonzero) digits is 1632960, while the sum is 51.

The square root of 684590397 is about 26164.6784234013. The cubic root of 684590397 is about 881.3402429792.

The spelling of 684590397 in words is "six hundred eighty-four million, five hundred ninety thousand, three hundred ninety-seven".