19994404 has 6 divisors (see below), whose sum is σ = 34990214. Its totient is φ = 9997200.

The previous prime is 19994389. The next prime is 19994407. The reversal of 19994404 is 40449991.

It can be written as a sum of positive squares in only one way, i.e., 14424804 + 5569600 = 3798^2 + 2360^2 .

It is not an unprimeable number, because it can be changed into a prime (19994407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2499297 + ... + 2499304.

Almost surely, 2^19994404 is an apocalyptic number.

It is an amenable number.

19994404 is a deficient number, since it is larger than the sum of its proper divisors (14995810).

19994404 is a wasteful number, since it uses less digits than its factorization.

19994404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4998605 (or 4998603 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 19994404 is about 4471.5102594090. The cubic root of 19994404 is about 271.4164428296.

The spelling of 19994404 in words is "nineteen million, nine hundred ninety-four thousand, four hundred four".