18661245 has 8 divisors (see below), whose sum is σ = 29858016. Its totient is φ = 9952656.

The previous prime is 18661243. The next prime is 18661259. The reversal of 18661245 is 54216681.

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

It is not a de Polignac number, because 18661245 - 2¹ = 18661243 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18661243) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622027 + ... + 622056.

It is an arithmetic number, because the mean of its divisors is an integer number (3732252).

Almost surely, 2^18661245 is an apocalyptic number.

18661245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18661245 is a deficient number, since it is larger than the sum of its proper divisors (11196771).

18661245 is a wasteful number, since it uses less digits than its factorization.

18661245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244091.

The product of its digits is 11520, while the sum is 33.

The square root of 18661245 is about 4319.8663173760. The cubic root of 18661245 is about 265.2447957517.

The spelling of 18661245 in words is "eighteen million, six hundred sixty-one thousand, two hundred forty-five".