18868047 has 8 divisors (see below), whose sum is σ = 27444480. Its totient is φ = 11435160.

The previous prime is 18868043. The next prime is 18868049. The reversal of 18868047 is 74086881.

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

It is not a de Polignac number, because 18868047 - 2² = 18868043 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18868043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 285847 + ... + 285912.

It is an arithmetic number, because the mean of its divisors is an integer number (3430560).

Almost surely, 2^18868047 is an apocalyptic number.

18868047 is a deficient number, since it is larger than the sum of its proper divisors (8576433).

18868047 is a wasteful number, since it uses less digits than its factorization.

18868047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571773.

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 18868047 is about 4343.7365251590. The cubic root of 18868047 is about 266.2210036971.

The spelling of 18868047 in words is "eighteen million, eight hundred sixty-eight thousand, forty-seven".