685420986 has 16 divisors (see below), whose sum is σ = 1375253568. Its totient is φ = 227738400.

The previous prime is 685420979. The next prime is 685420997. The reversal of 685420986 is 689024586.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 181795 + ... + 185526.

It is an arithmetic number, because the mean of its divisors is an integer number (85953348).

Almost surely, 2^685420986 is an apocalyptic number.

685420986 is an abundant number, since it is smaller than the sum of its proper divisors (689832582).

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

685420986 is a wasteful number, since it uses less digits than its factorization.

685420986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367637.

The product of its (nonzero) digits is 829440, while the sum is 48.

The square root of 685420986 is about 26180.5459454153. The cubic root of 685420986 is about 881.6965317734.

The spelling of 685420986 in words is "six hundred eighty-five million, four hundred twenty thousand, nine hundred eighty-six".