18039469 has 16 divisors (see below), whose sum is σ = 21248640. Its totient is φ = 14996160.

The previous prime is 18039449. The next prime is 18039491. The reversal of 18039469 is 96493081.

It is a cyclic number.

It is not a de Polignac number, because 18039469 - 2¹⁵ = 18006701 is a prime.

It is a super-2 number, since 2×18039469² = 650844883603922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18039419) 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, 35187 + ... + 35695.

It is an arithmetic number, because the mean of its divisors is an integer number (1328040).

Almost surely, 2^18039469 is an apocalyptic number.

It is an amenable number.

18039469 is a deficient number, since it is larger than the sum of its proper divisors (3209171).

18039469 is an equidigital number, since it uses as much as digits as its factorization.

18039469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 18039469 is about 4247.2896063254. The cubic root of 18039469 is about 262.2655515143.

The spelling of 18039469 in words is "eighteen million, thirty-nine thousand, four hundred sixty-nine".