685738399 has 8 divisors (see below), whose sum is σ = 717511680. Its totient is φ = 654128376.

The previous prime is 685738387. The next prime is 685738411. The reversal of 685738399 is 993837586.

It is an interprime number because it is at equal distance from previous prime (685738387) and next prime (685738411).

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 685738399 - 2¹⁷ = 685607327 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685738309) 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, 32179 + ... + 49060.

It is an arithmetic number, because the mean of its divisors is an integer number (89688960).

Almost surely, 2^685738399 is an apocalyptic number.

685738399 is a deficient number, since it is larger than the sum of its proper divisors (31773281).

685738399 is a wasteful number, since it uses less digits than its factorization.

685738399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81629.

The product of its digits is 9797760, while the sum is 58.

The square root of 685738399 is about 26186.6072449258. The cubic root of 685738399 is about 881.8326129836.

The spelling of 685738399 in words is "six hundred eighty-five million, seven hundred thirty-eight thousand, three hundred ninety-nine".