18999941 has 4 divisors (see below), whose sum is σ = 19017900. Its totient is φ = 18981984.

The previous prime is 18999919. The next prime is 18999971. The reversal of 18999941 is 14999981.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 894916 + 18105025 = 946^2 + 4255^2 .

It is a cyclic number.

It is not a de Polignac number, because 18999941 - 2¹⁴ = 18983557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18999941.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18999971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7286 + ... + 9543.

It is an arithmetic number, because the mean of its divisors is an integer number (4754475).

Almost surely, 2^18999941 is an apocalyptic number.

It is an amenable number.

18999941 is a deficient number, since it is larger than the sum of its proper divisors (17959).

18999941 is a wasteful number, since it uses less digits than its factorization.

18999941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17958.

The product of its digits is 209952, while the sum is 50.

The square root of 18999941 is about 4358.8921757713. The cubic root of 18999941 is about 266.8398886689.

The spelling of 18999941 in words is "eighteen million, nine hundred ninety-nine thousand, nine hundred forty-one".