19870242 has 16 divisors (see below), whose sum is σ = 45417792. Its totient is φ = 5677200.

The previous prime is 19870231. The next prime is 19870243. The reversal of 19870242 is 24207891.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (19870243) by changing a digit.

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, 236509 + ... + 236592.

It is an arithmetic number, because the mean of its divisors is an integer number (2838612).

Almost surely, 2^19870242 is an apocalyptic number.

19870242 is an abundant number, since it is smaller than the sum of its proper divisors (25547550).

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

19870242 is a wasteful number, since it uses less digits than its factorization.

19870242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473113.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 19870242 is about 4457.6049623088. The cubic root of 19870242 is about 270.8534585334.

The spelling of 19870242 in words is "nineteen million, eight hundred seventy thousand, two hundred forty-two".