1685122290 has 48 divisors (see below), whose sum is σ = 4383346968. Its totient is φ = 449157888.

The previous prime is 1685122277. The next prime is 1685122321. The reversal of 1685122290 is 922215861.

It can be written as a sum of positive squares in 4 ways, for example, as 576432081 + 1108690209 = 24009^2 + 33297^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 364272 + ... + 368868.

Almost surely, 2^1685122290 is an apocalyptic number.

1685122290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1685122290 is an abundant number, since it is smaller than the sum of its proper divisors (2698224678).

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

1685122290 is a wasteful number, since it uses less digits than its factorization.

1685122290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8683 (or 8680 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1685122290 is about 41050.2410467953. The cubic root of 1685122290 is about 1189.9913588338.

The spelling of 1685122290 in words is "one billion, six hundred eighty-five million, one hundred twenty-two thousand, two hundred ninety".