1685117290 has 24 divisors (see below), whose sum is σ = 3085556580. Its totient is φ = 662608704.

The previous prime is 1685117257. The next prime is 1685117303. The reversal of 1685117290 is 927115861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1530139689 + 154977601 = 39117^2 + 12449^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10606 + ... + 59014.

Almost surely, 2^1685117290 is an apocalyptic number.

1685117290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1685117290 is a deficient number, since it is larger than the sum of its proper divisors (1400439290).

1685117290 is an equidigital number, since it uses as much as digits as its factorization.

1685117290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48534 (or 48475 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 40.

The square root of 1685117290 is about 41050.1801457679. The cubic root of 1685117290 is about 1189.9901818741.

The spelling of 1685117290 in words is "one billion, six hundred eighty-five million, one hundred seventeen thousand, two hundred ninety".