18994841 has 2 divisors, whose sum is σ = 18994842. Its totient is φ = 18994840.

The previous prime is 18994823. The next prime is 18994861. The reversal of 18994841 is 14849981.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18361225 + 633616 = 4285^2 + 796^2 .

It is a cyclic number.

It is not a de Polignac number, because 18994841 - 2¹⁴ = 18978457 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18994792 and 18994801.

It is not a weakly prime, because it can be changed into another prime (18994861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9497420 + 9497421.

It is an arithmetic number, because the mean of its divisors is an integer number (9497421).

Almost surely, 2^18994841 is an apocalyptic number.

It is an amenable number.

18994841 is a deficient number, since it is larger than the sum of its proper divisors (1).

18994841 is an equidigital number, since it uses as much as digits as its factorization.

18994841 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 44.

The square root of 18994841 is about 4358.3071254789. The cubic root of 18994841 is about 266.8160113103.

The spelling of 18994841 in words is "eighteen million, nine hundred ninety-four thousand, eight hundred forty-one".