18154349 has 4 divisors (see below), whose sum is σ = 18597180. Its totient is φ = 17711520.

The previous prime is 18154343. The next prime is 18154363. The reversal of 18154349 is 94345181.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6300100 + 11854249 = 2510^2 + 3443^2 .

It is a cyclic number.

It is not a de Polignac number, because 18154349 - 2⁴ = 18154333 is a prime.

It is a super-2 number, since 2×18154349² = 659160775227602, 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 (18154343) 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 3 ways as a sum of consecutive naturals, for example, 221354 + ... + 221435.

It is an arithmetic number, because the mean of its divisors is an integer number (4649295).

Almost surely, 2^18154349 is an apocalyptic number.

It is an amenable number.

18154349 is a deficient number, since it is larger than the sum of its proper divisors (442831).

18154349 is an equidigital number, since it uses as much as digits as its factorization.

18154349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442830.

The product of its digits is 17280, while the sum is 35.

The square root of 18154349 is about 4260.7920625161. The cubic root of 18154349 is about 262.8210988221.

The spelling of 18154349 in words is "eighteen million, one hundred fifty-four thousand, three hundred forty-nine".