18439886 has 8 divisors (see below), whose sum is σ = 28248480. Its totient is φ = 9023728.

The previous prime is 18439877. The next prime is 18439903. The reversal of 18439886 is 68893481.

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

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 18439886.

It is a congruent number.

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, 97991 + ... + 98178.

It is an arithmetic number, because the mean of its divisors is an integer number (3531060).

Almost surely, 2^18439886 is an apocalyptic number.

18439886 is a deficient number, since it is larger than the sum of its proper divisors (9808594).

18439886 is a wasteful number, since it uses less digits than its factorization.

18439886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196218.

The product of its digits is 331776, while the sum is 47.

The square root of 18439886 is about 4294.1688369229. The cubic root of 18439886 is about 264.1918467021.

The spelling of 18439886 in words is "eighteen million, four hundred thirty-nine thousand, eight hundred eighty-six".