18749986 has 8 divisors (see below), whose sum is σ = 28441260. Its totient is φ = 9269568.

The previous prime is 18749959. The next prime is 18749993. The reversal of 18749986 is 68994781.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 18224361 + 525625 = 4269^2 + 725^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52491 + ... + 52846.

Almost surely, 2^18749986 is an apocalyptic number.

18749986 is a deficient number, since it is larger than the sum of its proper divisors (9691274).

18749986 is a wasteful number, since it uses less digits than its factorization.

18749986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105428.

The product of its digits is 870912, while the sum is 52.

The square root of 18749986 is about 4330.1254023411. The cubic root of 18749986 is about 265.6645761747.

The spelling of 18749986 in words is "eighteen million, seven hundred forty-nine thousand, nine hundred eighty-six".