18438347 has 4 divisors (see below), whose sum is σ = 18610776. Its totient is φ = 18265920.

The previous prime is 18438317. The next prime is 18438349. The reversal of 18438347 is 74383481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74383481 = 683 ⋅108907.

It is a cyclic number.

It is not a de Polignac number, because 18438347 - 2⁶ = 18438283 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18438347.

It is not an unprimeable number, because it can be changed into a prime (18438349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86054 + ... + 86267.

It is an arithmetic number, because the mean of its divisors is an integer number (4652694).

Almost surely, 2^18438347 is an apocalyptic number.

18438347 is a deficient number, since it is larger than the sum of its proper divisors (172429).

18438347 is a wasteful number, since it uses less digits than its factorization.

18438347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172428.

The product of its digits is 64512, while the sum is 38.

The square root of 18438347 is about 4293.9896366899. The cubic root of 18438347 is about 264.1844966465.

It can be divided in two parts, 1 and 8438347, that added together give a palindrome (8438348).

The spelling of 18438347 in words is "eighteen million, four hundred thirty-eight thousand, three hundred forty-seven".