18038438 has 24 divisors (see below), whose sum is σ = 30020760. Its totient is φ = 8122400.

The previous prime is 18038413. The next prime is 18038441. The reversal of 18038438 is 83483081.

It is a plaindrome in base 14.

It is a junction number, because it is equal to n+sod(n) for n = 18038398 and 18038407.

It is a congruent number.

It is an unprimeable number.

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, 31418 + ... + 31986.

It is an arithmetic number, because the mean of its divisors is an integer number (1250865).

Almost surely, 2^18038438 is an apocalyptic number.

18038438 is a deficient number, since it is larger than the sum of its proper divisors (11982322).

18038438 is a wasteful number, since it uses less digits than its factorization.

18038438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724 (or 713 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 18038438 is about 4247.1682330701. The cubic root of 18038438 is about 262.2605550454.

The spelling of 18038438 in words is "eighteen million, thirty-eight thousand, four hundred thirty-eight".