18661449 has 8 divisors (see below), whose sum is σ = 24958432. Its totient is φ = 12402720.

The previous prime is 18661429. The next prime is 18661457. The reversal of 18661449 is 94416681.

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

It is not a de Polignac number, because 18661449 - 2⁵ = 18661417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18661429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8404 + ... + 10389.

It is an arithmetic number, because the mean of its divisors is an integer number (3119804).

Almost surely, 2^18661449 is an apocalyptic number.

It is an amenable number.

18661449 is a deficient number, since it is larger than the sum of its proper divisors (6296983).

18661449 is a wasteful number, since it uses less digits than its factorization.

18661449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19127.

The product of its digits is 41472, while the sum is 39.

The square root of 18661449 is about 4319.8899291533. The cubic root of 18661449 is about 265.2457622778.

It can be divided in two parts, 18661 and 449, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18661449 in words is "eighteen million, six hundred sixty-one thousand, four hundred forty-nine".