18205434 has 24 divisors (see below), whose sum is σ = 42479892. Its totient is φ = 5601600.

The previous prime is 18205433. The next prime is 18205457. The reversal of 18205434 is 43450281.

It can be written as a sum of positive squares in 2 ways, for example, as 17665209 + 540225 = 4203^2 + 735^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18205398 and 18205407.

It is not an unprimeable number, because it can be changed into a prime (18205433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38667 + ... + 39134.

Almost surely, 2^18205434 is an apocalyptic number.

18205434 is an abundant number, since it is smaller than the sum of its proper divisors (24274458).

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

18205434 is a wasteful number, since it uses less digits than its factorization.

18205434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77822 (or 77819 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 18205434 is about 4266.7826286325. The cubic root of 18205434 is about 263.0673876870.

The spelling of 18205434 in words is "eighteen million, two hundred five thousand, four hundred thirty-four".