18366549 has 8 divisors (see below), whose sum is σ = 24521280. Its totient is φ = 12228096.

The previous prime is 18366533. The next prime is 18366563. The reversal of 18366549 is 94566381.

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

It is not a de Polignac number, because 18366549 - 2⁴ = 18366533 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18366549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18366529) 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, 1132 + ... + 6165.

It is an arithmetic number, because the mean of its divisors is an integer number (3065160).

Almost surely, 2^18366549 is an apocalyptic number.

It is an amenable number.

18366549 is a deficient number, since it is larger than the sum of its proper divisors (6154731).

18366549 is an equidigital number, since it uses as much as digits as its factorization.

18366549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8139.

The product of its digits is 155520, while the sum is 42.

The square root of 18366549 is about 4285.6211918461. The cubic root of 18366549 is about 263.8411435261.

It can be divided in two parts, 18366 and 549, that added together give a triangular number (18915 = T₁₉₄).

The spelling of 18366549 in words is "eighteen million, three hundred sixty-six thousand, five hundred forty-nine".