18039147 has 16 divisors (see below), whose sum is σ = 27900672. Its totient is φ = 10153440.

The previous prime is 18039127. The next prime is 18039149. The reversal of 18039147 is 74193081.

It is not a de Polignac number, because 18039147 - 2⁷ = 18039019 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18039149) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 5004 + ... + 7817.

It is an arithmetic number, because the mean of its divisors is an integer number (1743792).

Almost surely, 2^18039147 is an apocalyptic number.

18039147 is a deficient number, since it is larger than the sum of its proper divisors (9861525).

18039147 is a wasteful number, since it uses less digits than its factorization.

18039147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12898.

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 18039147 is about 4247.2516996288. The cubic root of 18039147 is about 262.2639910469.

The spelling of 18039147 in words is "eighteen million, thirty-nine thousand, one hundred forty-seven".