18145438 has 8 divisors (see below), whose sum is σ = 27252288. Its totient is φ = 9061344.

The previous prime is 18145423. The next prime is 18145471. The reversal of 18145438 is 83454181.

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

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3531 + ... + 6982.

It is an arithmetic number, because the mean of its divisors is an integer number (3406536).

Almost surely, 2^18145438 is an apocalyptic number.

18145438 is a deficient number, since it is larger than the sum of its proper divisors (9106850).

18145438 is a wasteful number, since it uses less digits than its factorization.

18145438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11378.

The product of its digits is 15360, while the sum is 34.

The square root of 18145438 is about 4259.7462365733. The cubic root of 18145438 is about 262.7780901725.

The spelling of 18145438 in words is "eighteen million, one hundred forty-five thousand, four hundred thirty-eight".