18914549 has 4 divisors (see below), whose sum is σ = 18931500. Its totient is φ = 18897600.

The previous prime is 18914543. The next prime is 18914563. The reversal of 18914549 is 94541981.

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 165649 + 18748900 = 407^2 + 4330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18914549 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 (18914543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6674 + ... + 9075.

It is an arithmetic number, because the mean of its divisors is an integer number (4732875).

Almost surely, 2^18914549 is an apocalyptic number.

It is an amenable number.

18914549 is a deficient number, since it is larger than the sum of its proper divisors (16951).

18914549 is a wasteful number, since it uses less digits than its factorization.

18914549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16950.

The product of its digits is 51840, while the sum is 41.

The square root of 18914549 is about 4349.0859959306. The cubic root of 18914549 is about 266.4395328085.

The spelling of 18914549 in words is "eighteen million, nine hundred fourteen thousand, five hundred forty-nine".