19866042 has 24 divisors (see below), whose sum is σ = 49192416. Its totient is φ = 5675976.

The previous prime is 19866031. The next prime is 19866113. The reversal of 19866042 is 24066891.

It is a junction number, because it is equal to n+sod(n) for n = 19865988 and 19866006.

It is an unprimeable number.

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, 78708 + ... + 78959.

It is an arithmetic number, because the mean of its divisors is an integer number (2049684).

Almost surely, 2^19866042 is an apocalyptic number.

19866042 is an abundant number, since it is smaller than the sum of its proper divisors (29326374).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19866042 is a wasteful number, since it uses less digits than its factorization.

19866042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157682 (or 157679 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The square root of 19866042 is about 4457.1338324084. The cubic root of 19866042 is about 270.8343736344.

The spelling of 19866042 in words is "nineteen million, eight hundred sixty-six thousand, forty-two".