18661349 has 16 divisors (see below), whose sum is σ = 22978560. Its totient is φ = 14802480.

The previous prime is 18661339. The next prime is 18661369. The reversal of 18661349 is 94316681.

It is not a de Polignac number, because 18661349 - 2⁴ = 18661333 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18661339) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3122 + ... + 6860.

It is an arithmetic number, because the mean of its divisors is an integer number (1436160).

Almost surely, 2^18661349 is an apocalyptic number.

It is an amenable number.

18661349 is a deficient number, since it is larger than the sum of its proper divisors (4317211).

18661349 is a wasteful number, since it uses less digits than its factorization.

18661349 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3800.

The product of its digits is 31104, while the sum is 38.

The square root of 18661349 is about 4319.8783547688. The cubic root of 18661349 is about 265.2452884914.

The spelling of 18661349 in words is "eighteen million, six hundred sixty-one thousand, three hundred forty-nine".