1685185890 has 16 divisors (see below), whose sum is σ = 4044446208. Its totient is φ = 449382896.

The previous prime is 1685185861. The next prime is 1685185903. The reversal of 1685185890 is 985815861.

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, 28086402 + ... + 28086461.

It is an arithmetic number, because the mean of its divisors is an integer number (252777888).

Almost surely, 2^1685185890 is an apocalyptic number.

1685185890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1685185890 is an abundant number, since it is smaller than the sum of its proper divisors (2359260318).

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

1685185890 is a wasteful number, since it uses less digits than its factorization.

1685185890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56172873.

The product of its (nonzero) digits is 691200, while the sum is 51.

The square root of 1685185890 is about 41051.0156999799. The cubic root of 1685185890 is about 1190.0063295570.

The spelling of 1685185890 in words is "one billion, six hundred eighty-five million, one hundred eighty-five thousand, eight hundred ninety".