19803994 has 32 divisors (see below), whose sum is σ = 35329536. Its totient is φ = 8149680.

The previous prime is 19803983. The next prime is 19804003. The reversal of 19803994 is 49930891.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a self number, because there is not a number n which added to its sum of digits gives 19803994.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40089 + ... + 40579.

It is an arithmetic number, because the mean of its divisors is an integer number (1104048).

Almost surely, 2^19803994 is an apocalyptic number.

19803994 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19803994 is a deficient number, since it is larger than the sum of its proper divisors (15525542).

19803994 is a wasteful number, since it uses less digits than its factorization.

19803994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 19803994 is about 4450.1678620025. The cubic root of 19803994 is about 270.5521121225.

The spelling of 19803994 in words is "nineteen million, eight hundred three thousand, nine hundred ninety-four".