18520849 has 4 divisors (see below), whose sum is σ = 18645300. Its totient is φ = 18396400.

The previous prime is 18520841. The next prime is 18520883. The reversal of 18520849 is 94802581.

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 9859600 + 8661249 = 3140^2 + 2943^2 .

It is a cyclic number.

It is not a de Polignac number, because 18520849 - 2³ = 18520841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18520841) 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, 62002 + ... + 62299.

It is an arithmetic number, because the mean of its divisors is an integer number (4661325).

Almost surely, 2^18520849 is an apocalyptic number.

It is an amenable number.

18520849 is a deficient number, since it is larger than the sum of its proper divisors (124451).

18520849 is a wasteful number, since it uses less digits than its factorization.

18520849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124450.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 18520849 is about 4303.5855980798. The cubic root of 18520849 is about 264.5779397554.

The spelling of 18520849 in words is "eighteen million, five hundred twenty thousand, eight hundred forty-nine".