18506534 has 4 divisors (see below), whose sum is σ = 27759804. Its totient is φ = 9253266.

The previous prime is 18506519. The next prime is 18506561. The reversal of 18506534 is 43560581.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18506534.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4626632 + ... + 4626635.

It is an arithmetic number, because the mean of its divisors is an integer number (6939951).

Almost surely, 2^18506534 is an apocalyptic number.

18506534 is a deficient number, since it is larger than the sum of its proper divisors (9253270).

18506534 is an equidigital number, since it uses as much as digits as its factorization.

18506534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9253269.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 18506534 is about 4301.9221285374. The cubic root of 18506534 is about 264.5097569666.

The spelling of 18506534 in words is "eighteen million, five hundred six thousand, five hundred thirty-four".