19968994 has 8 divisors (see below), whose sum is σ = 30986460. Its totient is φ = 9640176.

The previous prime is 19968989. The next prime is 19968997. The reversal of 19968994 is 49986991.

19968994 = T₁₁₅₉ + T₁₁₆₀ + ... + T₁₁₈₇.

It can be written as a sum of positive squares in 2 ways, for example, as 19918369 + 50625 = 4463^2 + 225^2 .

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 (19968997) 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, 172089 + ... + 172204.

Almost surely, 2^19968994 is an apocalyptic number.

19968994 is a deficient number, since it is larger than the sum of its proper divisors (11017466).

19968994 is a wasteful number, since it uses less digits than its factorization.

19968994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344324.

The product of its digits is 1259712, while the sum is 55.

The square root of 19968994 is about 4468.6680342133. The cubic root of 19968994 is about 271.3014170547.

The spelling of 19968994 in words is "nineteen million, nine hundred sixty-eight thousand, nine hundred ninety-four".