685390842 has 32 divisors (see below), whose sum is σ = 1572226560. Its totient is φ = 221093280.

The previous prime is 685390841. The next prime is 685390883. The reversal of 685390842 is 248093586.

It is not an unprimeable number, because it can be changed into a prime (685390841) 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, 203043 + ... + 206390.

It is an arithmetic number, because the mean of its divisors is an integer number (49132080).

Almost surely, 2^685390842 is an apocalyptic number.

685390842 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

685390842 is an abundant number, since it is smaller than the sum of its proper divisors (886835718).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

685390842 is a wasteful number, since it uses less digits than its factorization.

685390842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409475 (or 409469 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The square root of 685390842 is about 26179.9702444445. The cubic root of 685390842 is about 881.6836062622.

The spelling of 685390842 in words is "six hundred eighty-five million, three hundred ninety thousand, eight hundred forty-two".