685938457 has 8 divisors (see below), whose sum is σ = 749716992. Its totient is φ = 624763200.

The previous prime is 685938427. The next prime is 685938467. The reversal of 685938457 is 754839586.

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 685938457 - 2⁷ = 685938329 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 685938398 and 685938407.

It is not an unprimeable number, because it can be changed into a prime (685938427) 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, 650269 + ... + 651322.

It is an arithmetic number, because the mean of its divisors is an integer number (93714624).

Almost surely, 2^685938457 is an apocalyptic number.

It is an amenable number.

685938457 is a deficient number, since it is larger than the sum of its proper divisors (63778535).

685938457 is a wasteful number, since it uses less digits than its factorization.

685938457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301639.

The product of its digits is 7257600, while the sum is 55.

The square root of 685938457 is about 26190.4268197370. The cubic root of 685938457 is about 881.9183602189.

The spelling of 685938457 in words is "six hundred eighty-five million, nine hundred thirty-eight thousand, four hundred fifty-seven".