18505434 has 16 divisors (see below), whose sum is σ = 37480320. Its totient is φ = 6090240.

The previous prime is 18505423. The next prime is 18505441. The reversal of 18505434 is 43450581.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19047 + ... + 19994.

It is an arithmetic number, because the mean of its divisors is an integer number (2342520).

Almost surely, 2^18505434 is an apocalyptic number.

18505434 is an abundant number, since it is smaller than the sum of its proper divisors (18974886).

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

18505434 is a wasteful number, since it uses less digits than its factorization.

18505434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39125.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 18505434 is about 4301.7942768105. The cubic root of 18505434 is about 264.5045161780.

The spelling of 18505434 in words is "eighteen million, five hundred five thousand, four hundred thirty-four".