1890985866 has 32 divisors (see below), whose sum is σ = 4715186688. Its totient is φ = 491165040.

The previous prime is 1890985853. The next prime is 1890985879. The reversal of 1890985866 is 6685890981.

It is an interprime number because it is at equal distance from previous prime (1890985853) and next prime (1890985879).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2046060 + ... + 2046983.

It is an arithmetic number, because the mean of its divisors is an integer number (147349584).

Almost surely, 2^1890985866 is an apocalyptic number.

1890985866 is an abundant number, since it is smaller than the sum of its proper divisors (2824200822).

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

1890985866 is a wasteful number, since it uses less digits than its factorization.

1890985866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4093066.

The product of its (nonzero) digits is 7464960, while the sum is 60.

The square root of 1890985866 is about 43485.4672965578. The cubic root of 1890985866 is about 1236.6005279744.

The spelling of 1890985866 in words is "one billion, eight hundred ninety million, nine hundred eighty-five thousand, eight hundred sixty-six".