18399674 has 16 divisors (see below), whose sum is σ = 28483296. Its totient is φ = 8910000.

The previous prime is 18399673. The next prime is 18399691. The reversal of 18399674 is 47699381.

It is not an unprimeable number, because it can be changed into a prime (18399673) 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, 7049 + ... + 9299.

It is an arithmetic number, because the mean of its divisors is an integer number (1780206).

Almost surely, 2^18399674 is an apocalyptic number.

18399674 is a deficient number, since it is larger than the sum of its proper divisors (10083622).

18399674 is a wasteful number, since it uses less digits than its factorization.

18399674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2381.

The product of its digits is 326592, while the sum is 47.

The square root of 18399674 is about 4289.4841181662. The cubic root of 18399674 is about 263.9996652123. Note that the first 3 decimals are identical.

The spelling of 18399674 in words is "eighteen million, three hundred ninety-nine thousand, six hundred seventy-four".