18975986 has 16 divisors (see below), whose sum is σ = 29281824. Its totient is φ = 9217824.

The previous prime is 18975973. The next prime is 18975991. The reversal of 18975986 is 68957981.

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 7 ways as a sum of consecutive naturals, for example, 19565 + ... + 20511.

It is an arithmetic number, because the mean of its divisors is an integer number (1830114).

Almost surely, 2^18975986 is an apocalyptic number.

18975986 is a deficient number, since it is larger than the sum of its proper divisors (10305838).

18975986 is a wasteful number, since it uses less digits than its factorization.

18975986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1225.

The product of its digits is 1088640, while the sum is 53.

The square root of 18975986 is about 4356.1434778942. The cubic root of 18975986 is about 266.7276981835.

The spelling of 18975986 in words is "eighteen million, nine hundred seventy-five thousand, nine hundred eighty-six".