18142538 has 16 divisors (see below), whose sum is σ = 28598400. Its totient is φ = 8615376.

The previous prime is 18142513. The next prime is 18142567. The reversal of 18142538 is 83524181.

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 7 ways as a sum of consecutive naturals, for example, 5531 + ... + 8177.

It is an arithmetic number, because the mean of its divisors is an integer number (1787400).

Almost surely, 2^18142538 is an apocalyptic number.

18142538 is a deficient number, since it is larger than the sum of its proper divisors (10455862).

18142538 is a wasteful number, since it uses less digits than its factorization.

18142538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2821.

The product of its digits is 7680, while the sum is 32.

The square root of 18142538 is about 4259.4058271078. The cubic root of 18142538 is about 262.7640903807.

The spelling of 18142538 in words is "eighteen million, one hundred forty-two thousand, five hundred thirty-eight".