18938459 has 12 divisors (see below), whose sum is σ = 21183000. Its totient is φ = 16881408.

The previous prime is 18938443. The next prime is 18938471. The reversal of 18938459 is 95483981.

It is not a de Polignac number, because 18938459 - 2⁴ = 18938443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18938419) 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 11 ways as a sum of consecutive naturals, for example, 3767 + ... + 7215.

It is an arithmetic number, because the mean of its divisors is an integer number (1765250).

Almost surely, 2^18938459 is an apocalyptic number.

18938459 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

18938459 is a deficient number, since it is larger than the sum of its proper divisors (2244541).

18938459 is a wasteful number, since it uses less digits than its factorization.

18938459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3502 (or 3485 counting only the distinct ones).

The product of its digits is 311040, while the sum is 47.

The square root of 18938459 is about 4351.8339812084. The cubic root of 18938459 is about 266.5517548297.

The spelling of 18938459 in words is "eighteen million, nine hundred thirty-eight thousand, four hundred fifty-nine".