18645434 has 16 divisors (see below), whose sum is σ = 29034720. Its totient is φ = 8969520.

The previous prime is 18645401. The next prime is 18645439. The reversal of 18645434 is 43454681.

It is a junction number, because it is equal to n+sod(n) for n = 18645394 and 18645403.

It is not an unprimeable number, because it can be changed into a prime (18645439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32369 + ... + 32939.

It is an arithmetic number, because the mean of its divisors is an integer number (1814670).

Almost surely, 2^18645434 is an apocalyptic number.

18645434 is a deficient number, since it is larger than the sum of its proper divisors (10389286).

18645434 is a wasteful number, since it uses less digits than its factorization.

18645434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1165.

The product of its digits is 46080, while the sum is 35.

The square root of 18645434 is about 4318.0358960991. The cubic root of 18645434 is about 265.1698638016.

The spelling of 18645434 in words is "eighteen million, six hundred forty-five thousand, four hundred thirty-four".