18035521 has 16 divisors (see below), whose sum is σ = 22533120. Its totient is φ = 14077440.

The previous prime is 18035513. The next prime is 18035543. The reversal of 18035521 is 12553081.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 18035521 - 2³ = 18035513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18035551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1245 + ... + 6133.

It is an arithmetic number, because the mean of its divisors is an integer number (1408320).

Almost surely, 2^18035521 is an apocalyptic number.

It is an amenable number.

18035521 is a deficient number, since it is larger than the sum of its proper divisors (4497599).

18035521 is a wasteful number, since it uses less digits than its factorization.

18035521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4944.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 18035521 is about 4246.8248139051. The cubic root of 18035521 is about 262.2464175449.

The spelling of 18035521 in words is "eighteen million, thirty-five thousand, five hundred twenty-one".