18005434 has 4 divisors (see below), whose sum is σ = 27008154. Its totient is φ = 9002716.

The previous prime is 18005423. The next prime is 18005447. The reversal of 18005434 is 43450081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43450081 = 43 ⋅1010467.

It can be written as a sum of positive squares in only one way, i.e., 17614809 + 390625 = 4197^2 + 625^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18005399 and 18005408.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4501357 + ... + 4501360.

Almost surely, 2^18005434 is an apocalyptic number.

18005434 is a deficient number, since it is larger than the sum of its proper divisors (9002720).

18005434 is an equidigital number, since it uses as much as digits as its factorization.

18005434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9002719.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 18005434 is about 4243.2810418354. The cubic root of 18005434 is about 262.1005091911.

The spelling of 18005434 in words is "eighteen million, five thousand, four hundred thirty-four".