685372389 has 16 divisors (see below), whose sum is σ = 1035921600. Its totient is φ = 399568896.

The previous prime is 685372381. The next prime is 685372411. The reversal of 685372389 is 983273586.

It is not a de Polignac number, because 685372389 - 2³ = 685372381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685372381) 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, 461724 + ... + 463205.

It is an arithmetic number, because the mean of its divisors is an integer number (64745100).

Almost surely, 2^685372389 is an apocalyptic number.

It is an amenable number.

685372389 is a deficient number, since it is larger than the sum of its proper divisors (350549211).

685372389 is a wasteful number, since it uses less digits than its factorization.

685372389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 924964.

The product of its digits is 2177280, while the sum is 51.

The square root of 685372389 is about 26179.6178161561. The cubic root of 685372389 is about 881.6756935733.

The spelling of 685372389 in words is "six hundred eighty-five million, three hundred seventy-two thousand, three hundred eighty-nine".