18120269 has 8 divisors (see below), whose sum is σ = 18784920. Its totient is φ = 17464896.

The previous prime is 18120259. The next prime is 18120287. The reversal of 18120269 is 96202181.

It can be written as a sum of positive squares in 4 ways, for example, as 14160169 + 3960100 = 3763^2 + 1990^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18120269 - 2⁴ = 18120253 is a prime.

It is a super-2 number, since 2×18120269² = 656688297264722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18120209) 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 7 ways as a sum of consecutive naturals, for example, 1787 + ... + 6279.

It is an arithmetic number, because the mean of its divisors is an integer number (2348115).

Almost surely, 2^18120269 is an apocalyptic number.

It is an amenable number.

18120269 is a deficient number, since it is larger than the sum of its proper divisors (664651).

18120269 is a wasteful number, since it uses less digits than its factorization.

18120269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4639.

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 18120269 is about 4256.7909274476. The cubic root of 18120269 is about 262.6565367170.

The spelling of 18120269 in words is "eighteen million, one hundred twenty thousand, two hundred sixty-nine".