19998994 has 8 divisors (see below), whose sum is σ = 30507120. Its totient is φ = 9829956.

The previous prime is 19998991. The next prime is 19999013. The reversal of 19998994 is 49989991.

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

It is a super-2 number, since 2×19998994² = 799919522024072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19998991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84624 + ... + 84859.

It is an arithmetic number, because the mean of its divisors is an integer number (3813390).

Almost surely, 2^19998994 is an apocalyptic number.

19998994 is a deficient number, since it is larger than the sum of its proper divisors (10508126).

19998994 is a wasteful number, since it uses less digits than its factorization.

19998994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169544.

The product of its digits is 1889568, while the sum is 58.

The square root of 19998994 is about 4472.0234793659. The cubic root of 19998994 is about 271.4372104096.

It can be divided in two parts, 1999 and 8994, that multiplied together give a triangular number (17979006 = T₅₉₉₆).

The spelling of 19998994 in words is "nineteen million, nine hundred ninety-eight thousand, nine hundred ninety-four".