18121734 has 36 divisors (see below), whose sum is σ = 40043484. Its totient is φ = 5922432.

The previous prime is 18121721. The next prime is 18121759. The reversal of 18121734 is 43712181.

It is a junction number, because it is equal to n+sod(n) for n = 18121698 and 18121707.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 169309 + ... + 169415.

It is an arithmetic number, because the mean of its divisors is an integer number (1112319).

Almost surely, 2^18121734 is an apocalyptic number.

18121734 is an abundant number, since it is smaller than the sum of its proper divisors (21921750).

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

18121734 is a wasteful number, since it uses less digits than its factorization.

18121734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309 (or 209 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 18121734 is about 4256.9630019534. The cubic root of 18121734 is about 262.6636150052.

The spelling of 18121734 in words is "eighteen million, one hundred twenty-one thousand, seven hundred thirty-four".