18373329 has 12 divisors (see below), whose sum is σ = 28580916. Its totient is φ = 11306592.

The previous prime is 18373321. The next prime is 18373331. The reversal of 18373329 is 92337381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 6656400 + 11716929 = 2580^2 + 3423^2 .

It is not a de Polignac number, because 18373329 - 2³ = 18373321 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 18373293 and 18373302.

It is not an unprimeable number, because it can be changed into a prime (18373321) 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 11 ways as a sum of consecutive naturals, for example, 78402 + ... + 78635.

It is an arithmetic number, because the mean of its divisors is an integer number (2381743).

Almost surely, 2^18373329 is an apocalyptic number.

It is an amenable number.

18373329 is a deficient number, since it is larger than the sum of its proper divisors (10207587).

18373329 is a wasteful number, since it uses less digits than its factorization.

18373329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157056 (or 157053 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 18373329 is about 4286.4121360411. The cubic root of 18373329 is about 263.8736051294.

The spelling of 18373329 in words is "eighteen million, three hundred seventy-three thousand, three hundred twenty-nine".