19994018 has 8 divisors (see below), whose sum is σ = 32717520. Its totient is φ = 9088180.

The previous prime is 19994003. The next prime is 19994033. The reversal of 19994018 is 81049991.

It is an interprime number because it is at equal distance from previous prime (19994003) and next prime (19994033).

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 454388 + ... + 454431.

It is an arithmetic number, because the mean of its divisors is an integer number (4089690).

Almost surely, 2^19994018 is an apocalyptic number.

19994018 is a deficient number, since it is larger than the sum of its proper divisors (12723502).

19994018 is a wasteful number, since it uses less digits than its factorization.

19994018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 908832.

The product of its (nonzero) digits is 23328, while the sum is 41.

The square root of 19994018 is about 4471.4670970499. The cubic root of 19994018 is about 271.4146962172.

The spelling of 19994018 in words is "nineteen million, nine hundred ninety-four thousand, eighteen".