18994901 has 4 divisors (see below), whose sum is σ = 19019532. Its totient is φ = 18970272.

The previous prime is 18994891. The next prime is 18994903. The reversal of 18994901 is 10949981.

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 13359025 + 5635876 = 3655^2 + 2374^2 .

It is a cyclic number.

It is not a de Polignac number, because 18994901 - 2¹⁴ = 18978517 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994903) 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 3 ways as a sum of consecutive naturals, for example, 11120 + ... + 12713.

It is an arithmetic number, because the mean of its divisors is an integer number (4754883).

Almost surely, 2^18994901 is an apocalyptic number.

It is an amenable number.

18994901 is a deficient number, since it is larger than the sum of its proper divisors (24631).

18994901 is an equidigital number, since it uses as much as digits as its factorization.

18994901 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24630.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 18994901 is about 4358.3140088800. The cubic root of 18994901 is about 266.8162922453.

The spelling of 18994901 in words is "eighteen million, nine hundred ninety-four thousand, nine hundred one".