1866684994 has 16 divisors (see below), whose sum is σ = 2861899776. Its totient is φ = 912750400.

The previous prime is 1866684961. The next prime is 1866685003. The reversal of 1866684994 is 4994866681.

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, 120639 + ... + 135229.

It is an arithmetic number, because the mean of its divisors is an integer number (178868736).

Almost surely, 2^1866684994 is an apocalyptic number.

1866684994 is a deficient number, since it is larger than the sum of its proper divisors (995214782).

1866684994 is a wasteful number, since it uses less digits than its factorization.

1866684994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16001.

The product of its digits is 17915904, while the sum is 61.

The square root of 1866684994 is about 43205.1500865348. The cubic root of 1866684994 is about 1231.2805299309.

The spelling of 1866684994 in words is "one billion, eight hundred sixty-six million, six hundred eighty-four thousand, nine hundred ninety-four".