18849521 has 8 divisors (see below), whose sum is σ = 19079424. Its totient is φ = 18621360.

The previous prime is 18849511. The next prime is 18849527. The reversal of 18849521 is 12594881.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18849521 - 2¹⁰ = 18848497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18849527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40130 + ... + 40596.

It is an arithmetic number, because the mean of its divisors is an integer number (2384928).

Almost surely, 2^18849521 is an apocalyptic number.

It is an amenable number.

18849521 is a deficient number, since it is larger than the sum of its proper divisors (229903).

18849521 is a wasteful number, since it uses less digits than its factorization.

18849521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871.

The product of its digits is 23040, while the sum is 38.

The square root of 18849521 is about 4341.6035056186. The cubic root of 18849521 is about 266.1338435476.

The spelling of 18849521 in words is "eighteen million, eight hundred forty-nine thousand, five hundred twenty-one".