18679994 has 8 divisors (see below), whose sum is σ = 28047060. Its totient is φ = 9330976.

The previous prime is 18679993. The next prime is 18680003. The reversal of 18679994 is 49997681.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17935225 + 744769 = 4235^2 + 863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (18679993) 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 3 ways as a sum of consecutive naturals, for example, 1529 + ... + 6300.

Almost surely, 2^18679994 is an apocalyptic number.

18679994 is a deficient number, since it is larger than the sum of its proper divisors (9367066).

18679994 is a wasteful number, since it uses less digits than its factorization.

18679994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9024.

The product of its digits is 979776, while the sum is 53.

The square root of 18679994 is about 4322.0358628776. The cubic root of 18679994 is about 265.3335967243. Note that the first 3 decimals are identical.

The spelling of 18679994 in words is "eighteen million, six hundred seventy-nine thousand, nine hundred ninety-four".