18986441 has 2 divisors, whose sum is σ = 18986442. Its totient is φ = 18986440.

The previous prime is 18986423. The next prime is 18986447. The reversal of 18986441 is 14468981.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10106041 + 8880400 = 3179^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 18986441 - 2¹⁴ = 18970057 is a prime.

It is not a weakly prime, because it can be changed into another prime (18986447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9493220 + 9493221.

It is an arithmetic number, because the mean of its divisors is an integer number (9493221).

Almost surely, 2^18986441 is an apocalyptic number.

It is an amenable number.

18986441 is a deficient number, since it is larger than the sum of its proper divisors (1).

18986441 is an equidigital number, since it uses as much as digits as its factorization.

18986441 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55296, while the sum is 41.

The square root of 18986441 is about 4357.3433419918. The cubic root of 18986441 is about 266.7766745775.

The spelling of 18986441 in words is "eighteen million, nine hundred eighty-six thousand, four hundred forty-one".