18642038 has 8 divisors (see below), whose sum is σ = 28010232. Its totient is φ = 9305296.

The previous prime is 18642037. The next prime is 18642101. The reversal of 18642038 is 83024681.

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

It is a junction number, because it is equal to n+sod(n) for n = 18641995 and 18642013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18642037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6320 + ... + 8787.

It is an arithmetic number, because the mean of its divisors is an integer number (3501279).

Almost surely, 2^18642038 is an apocalyptic number.

18642038 is a deficient number, since it is larger than the sum of its proper divisors (9368194).

18642038 is a wasteful number, since it uses less digits than its factorization.

18642038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15726.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 18642038 is about 4317.6426438509. The cubic root of 18642038 is about 265.1537638539.

It can be divided in two parts, 186 and 42038, that added together give a palindrome (42224).

The spelling of 18642038 in words is "eighteen million, six hundred forty-two thousand, thirty-eight".