19989946 has 16 divisors (see below), whose sum is σ = 30919680. Its totient is φ = 9687600.

The previous prime is 19989917. The next prime is 19989971. The reversal of 19989946 is 64998991.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9271 + ... + 11221.

It is an arithmetic number, because the mean of its divisors is an integer number (1932480).

Almost surely, 2^19989946 is an apocalyptic number.

19989946 is a deficient number, since it is larger than the sum of its proper divisors (10929734).

19989946 is a wasteful number, since it uses less digits than its factorization.

19989946 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2109.

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

The square root of 19989946 is about 4471.0117423241. The cubic root of 19989946 is about 271.3962694445.

It can be divided in two parts, 1998994 and 6, that added together give a triangular number (1999000 = T₁₉₉₉).

The spelling of 19989946 in words is "nineteen million, nine hundred eighty-nine thousand, nine hundred forty-six".