18438147 has 48 divisors (see below), whose sum is σ = 33546240. Its totient is φ = 9498816.

The previous prime is 18438143. The next prime is 18438163. The reversal of 18438147 is 74183481.

It is not a de Polignac number, because 18438147 - 2² = 18438143 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438143) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 38254 + ... + 38732.

It is an arithmetic number, because the mean of its divisors is an integer number (698880).

Almost surely, 2^18438147 is an apocalyptic number.

18438147 is a deficient number, since it is larger than the sum of its proper divisors (15108093).

18438147 is a wasteful number, since it uses less digits than its factorization.

18438147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 552 (or 549 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 18438147 is about 4293.9663482612. The cubic root of 18438147 is about 264.1835414435.

The spelling of 18438147 in words is "eighteen million, four hundred thirty-eight thousand, one hundred forty-seven".