18975666 has 8 divisors (see below), whose sum is σ = 37951344. Its totient is φ = 6325220.

The previous prime is 18975653. The next prime is 18975679. The reversal of 18975666 is 66657981.

It is an interprime number because it is at equal distance from previous prime (18975653) and next prime (18975679).

It is a sphenic number, since it is the product of 3 distinct primes.

18975666 is an admirable number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1581300 + ... + 1581311.

It is an arithmetic number, because the mean of its divisors is an integer number (4743918).

Almost surely, 2^18975666 is an apocalyptic number.

18975666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18975666 is a wasteful number, since it uses less digits than its factorization.

18975666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3162616.

The product of its digits is 544320, while the sum is 48.

The square root of 18975666 is about 4356.1067480033. The cubic root of 18975666 is about 266.7261988615.

It can be divided in two parts, 189 and 75666, that added together give a triangular number (75855 = T₃₈₉).

The spelling of 18975666 in words is "eighteen million, nine hundred seventy-five thousand, six hundred sixty-six".