18272919 has 16 divisors (see below), whose sum is σ = 28743680. Its totient is φ = 10104480.

The previous prime is 18272873. The next prime is 18272939. The reversal of 18272919 is 91927281.

It is not a de Polignac number, because 18272919 - 2⁷ = 18272791 is a prime.

It is a super-2 number, since 2×18272919² = 667799137561122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18272939) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 13384 + ... + 14685.

It is an arithmetic number, because the mean of its divisors is an integer number (1796480).

Almost surely, 2^18272919 is an apocalyptic number.

18272919 is a deficient number, since it is larger than the sum of its proper divisors (10470761).

18272919 is a wasteful number, since it uses less digits than its factorization.

18272919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28110.

The product of its digits is 18144, while the sum is 39.

The square root of 18272919 is about 4274.6834970557. The cubic root of 18272919 is about 263.3920382214.

It can be divided in two parts, 18272 and 919, that added together give a palindrome (19191).

The spelling of 18272919 in words is "eighteen million, two hundred seventy-two thousand, nine hundred nineteen".