19990286 has 16 divisors (see below), whose sum is σ = 31017120. Its totient is φ = 9655200.

The previous prime is 19990279. The next prime is 19990291. The reversal of 19990286 is 68209991.

It is a super-2 number, since 2×19990286² = 799223068723592, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10280 + ... + 12068.

It is an arithmetic number, because the mean of its divisors is an integer number (1938570).

Almost surely, 2^19990286 is an apocalyptic number.

19990286 is a deficient number, since it is larger than the sum of its proper divisors (11026834).

19990286 is a wasteful number, since it uses less digits than its factorization.

19990286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979.

The product of its (nonzero) digits is 69984, while the sum is 44.

The square root of 19990286 is about 4471.0497648763. The cubic root of 19990286 is about 271.3978081214.

The spelling of 19990286 in words is "nineteen million, nine hundred ninety thousand, two hundred eighty-six".