685957199 has 8 divisors (see below), whose sum is σ = 711798912. Its totient is φ = 660565080.

The previous prime is 685957193. The next prime is 685957211. The reversal of 685957199 is 991759586.

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

It is a cyclic number.

It is not a de Polignac number, because 685957199 - 2²⁸ = 417521743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685957193) 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, 109289 + ... + 115394.

It is an arithmetic number, because the mean of its divisors is an integer number (88974864).

Almost surely, 2^685957199 is an apocalyptic number.

685957199 is a deficient number, since it is larger than the sum of its proper divisors (25841713).

685957199 is a wasteful number, since it uses less digits than its factorization.

685957199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224797.

The product of its digits is 6123600, while the sum is 59.

The square root of 685957199 is about 26190.7846197856. The cubic root of 685957199 is about 881.9263924086.

The spelling of 685957199 in words is "six hundred eighty-five million, nine hundred fifty-seven thousand, one hundred ninety-nine".