19994427 has 12 divisors (see below), whose sum is σ = 29877120. Its totient is φ = 12869808.

The previous prime is 19994413. The next prime is 19994449. The reversal of 19994427 is 72449991.

It is a happy number.

It is not a de Polignac number, because 19994427 - 2¹⁵ = 19961659 is a prime.

It is a super-2 number, since 2×19994427² = 799554222116658, which contains 22 as substring.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 38043 + ... + 38564.

It is an arithmetic number, because the mean of its divisors is an integer number (2489760).

Almost surely, 2^19994427 is an apocalyptic number.

19994427 is a deficient number, since it is larger than the sum of its proper divisors (9882693).

19994427 is a wasteful number, since it uses less digits than its factorization.

19994427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76642 (or 76639 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 19994427 is about 4471.5128312463. The cubic root of 19994427 is about 271.4165469017.

The spelling of 19994427 in words is "nineteen million, nine hundred ninety-four thousand, four hundred twenty-seven".