18403349 has 4 divisors (see below), whose sum is σ = 18750636. Its totient is φ = 18056064.

The previous prime is 18403337. The next prime is 18403351. The reversal of 18403349 is 94330481.

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 6027025 + 12376324 = 2455^2 + 3518^2 .

It is a cyclic number.

It is not a de Polignac number, because 18403349 - 2²⁴ = 1626133 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 (18403309) 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, 173564 + ... + 173669.

It is an arithmetic number, because the mean of its divisors is an integer number (4687659).

Almost surely, 2^18403349 is an apocalyptic number.

It is an amenable number.

18403349 is a deficient number, since it is larger than the sum of its proper divisors (347287).

18403349 is an equidigital number, since it uses as much as digits as its factorization.

18403349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347286.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 18403349 is about 4289.9124699695. The cubic root of 18403349 is about 264.0172404183.

The spelling of 18403349 in words is "eighteen million, four hundred three thousand, three hundred forty-nine".