18640334 has 4 divisors (see below), whose sum is σ = 27960504. Its totient is φ = 9320166.

The previous prime is 18640333. The next prime is 18640339. The reversal of 18640334 is 43304681.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 18640297 and 18640306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18640333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4660082 + ... + 4660085.

It is an arithmetic number, because the mean of its divisors is an integer number (6990126).

Almost surely, 2^18640334 is an apocalyptic number.

18640334 is a deficient number, since it is larger than the sum of its proper divisors (9320170).

18640334 is an equidigital number, since it uses as much as digits as its factorization.

18640334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9320169.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 18640334 is about 4317.4453094394. The cubic root of 18640334 is about 265.1456846982.

The spelling of 18640334 in words is "eighteen million, six hundred forty thousand, three hundred thirty-four".