18000434 has 4 divisors (see below), whose sum is σ = 27000654. Its totient is φ = 9000216.

The previous prime is 18000407. The next prime is 18000439. The reversal of 18000434 is 43400081.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 43400081 = 1973 ⋅21997.

It can be written as a sum of positive squares in only one way, i.e., 11256025 + 6744409 = 3355^2 + 2597^2 .

It is not an unprimeable number, because it can be changed into a prime (18000439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4500107 + ... + 4500110.

Almost surely, 2^18000434 is an apocalyptic number.

18000434 is a deficient number, since it is larger than the sum of its proper divisors (9000220).

18000434 is an equidigital number, since it uses as much as digits as its factorization.

18000434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9000219.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 18000434 is about 4242.6918342015. The cubic root of 18000434 is about 262.0762457035.

The spelling of 18000434 in words is "eighteen million, four hundred thirty-four", and thus it is an aban number.