685236940 has 24 divisors (see below), whose sum is σ = 1488619440. Its totient is φ = 264643008.

The previous prime is 685236917. The next prime is 685236941. The reversal of 685236940 is 49632586.

It is not an unprimeable number, because it can be changed into a prime (685236941) 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, 590142 + ... + 591301.

It is an arithmetic number, because the mean of its divisors is an integer number (62025810).

Almost surely, 2^685236940 is an apocalyptic number.

It is an amenable number.

685236940 is an abundant number, since it is smaller than the sum of its proper divisors (803382500).

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

685236940 is a wasteful number, since it uses less digits than its factorization.

685236940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1181481 (or 1181479 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 43.

The square root of 685236940 is about 26177.0307712697. The cubic root of 685236940 is about 881.6176083820.

The spelling of 685236940 in words is "six hundred eighty-five million, two hundred thirty-six thousand, nine hundred forty".