18109534 has 8 divisors (see below), whose sum is σ = 27194688. Its totient is φ = 9044640.

The previous prime is 18109501. The next prime is 18109547. The reversal of 18109534 is 43590181.

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

It is a junction number, because it is equal to n+sod(n) for n = 18109496 and 18109505.

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 in 3 ways as a sum of consecutive naturals, for example, 2587 + ... + 6550.

It is an arithmetic number, because the mean of its divisors is an integer number (3399336).

Almost surely, 2^18109534 is an apocalyptic number.

18109534 is a deficient number, since it is larger than the sum of its proper divisors (9085154).

18109534 is an equidigital number, since it uses as much as digits as its factorization.

18109534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10130.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 18109534 is about 4255.5298142534. The cubic root of 18109534 is about 262.6046578898.

The spelling of 18109534 in words is "eighteen million, one hundred nine thousand, five hundred thirty-four".