18345149 has 4 divisors (see below), whose sum is σ = 18936960. Its totient is φ = 17753340.

The previous prime is 18345137. The next prime is 18345157. The reversal of 18345149 is 94154381.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18345149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18345169) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295859 + ... + 295920.

It is an arithmetic number, because the mean of its divisors is an integer number (4734240).

Almost surely, 2^18345149 is an apocalyptic number.

It is an amenable number.

18345149 is a deficient number, since it is larger than the sum of its proper divisors (591811).

18345149 is an equidigital number, since it uses as much as digits as its factorization.

18345149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 591810.

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

The square root of 18345149 is about 4283.1237432509. The cubic root of 18345149 is about 263.7386311669.

The spelling of 18345149 in words is "eighteen million, three hundred forty-five thousand, one hundred forty-nine".