19867242 has 32 divisors (see below), whose sum is σ = 40940352. Its totient is φ = 6424704.

The previous prime is 19867241. The next prime is 19867259. The reversal of 19867242 is 24276891.

It is a self number, because there is not a number n which added to its sum of digits gives 19867242.

It is not an unprimeable number, because it can be changed into a prime (19867241) 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 15 ways as a sum of consecutive naturals, for example, 29008 + ... + 29684.

It is an arithmetic number, because the mean of its divisors is an integer number (1279386).

Almost surely, 2^19867242 is an apocalyptic number.

19867242 is an abundant number, since it is smaller than the sum of its proper divisors (21073110).

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

19867242 is a wasteful number, since it uses less digits than its factorization.

19867242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 822.

The product of its digits is 48384, while the sum is 39.

The square root of 19867242 is about 4457.2684460328. The cubic root of 19867242 is about 270.8398267371.

The spelling of 19867242 in words is "nineteen million, eight hundred sixty-seven thousand, two hundred forty-two".