18003534 has 16 divisors (see below), whose sum is σ = 36980688. Its totient is φ = 5838912.

The previous prime is 18003533. The next prime is 18003539. The reversal of 18003534 is 43530081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18003533) 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, 40327 + ... + 40770.

It is an arithmetic number, because the mean of its divisors is an integer number (2311293).

Almost surely, 2^18003534 is an apocalyptic number.

18003534 is an abundant number, since it is smaller than the sum of its proper divisors (18977154).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18003534 is a wasteful number, since it uses less digits than its factorization.

18003534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81139.

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 18003534 is about 4243.0571525729. The cubic root of 18003534 is about 262.0912895950.

The spelling of 18003534 in words is "eighteen million, three thousand, five hundred thirty-four".