18636241 has 8 divisors (see below), whose sum is σ = 20762280. Its totient is φ = 16609152.

The previous prime is 18636229. The next prime is 18636259. The reversal of 18636241 is 14263681.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1587600 + 17048641 = 1260^2 + 4129^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18636241 is a prime.

It is a super-2 number, since 2×18636241² = 694618957220162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18636221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24340 + ... + 25093.

It is an arithmetic number, because the mean of its divisors is an integer number (2595285).

Almost surely, 2^18636241 is an apocalyptic number.

It is an amenable number.

18636241 is a deficient number, since it is larger than the sum of its proper divisors (2126039).

18636241 is a wasteful number, since it uses less digits than its factorization.

18636241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49475.

The product of its digits is 6912, while the sum is 31.

The square root of 18636241 is about 4316.9712762538. The cubic root of 18636241 is about 265.1262765923.

The spelling of 18636241 in words is "eighteen million, six hundred thirty-six thousand, two hundred forty-one".