18945694 has 4 divisors (see below), whose sum is σ = 28418544. Its totient is φ = 9472846.

The previous prime is 18945691. The next prime is 18945727. The reversal of 18945694 is 49654981.

It is a happy number.

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

It is a super-2 number, since 2×18945694² = 717878642283272, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18945691) 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 as a sum of consecutive naturals, namely, 4736422 + ... + 4736425.

It is an arithmetic number, because the mean of its divisors is an integer number (7104636).

Almost surely, 2^18945694 is an apocalyptic number.

18945694 is a deficient number, since it is larger than the sum of its proper divisors (9472850).

18945694 is an equidigital number, since it uses as much as digits as its factorization.

18945694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9472849.

The product of its digits is 311040, while the sum is 46.

The square root of 18945694 is about 4352.6651605654. The cubic root of 18945694 is about 266.5856938180.

The spelling of 18945694 in words is "eighteen million, nine hundred forty-five thousand, six hundred ninety-four".