19639242 has 48 divisors (see below), whose sum is σ = 49271040. Its totient is φ = 5537376.

The previous prime is 19639237. The next prime is 19639253. The reversal of 19639242 is 24293691.

19639242 is a `hidden beast` number, since 19 + 639 + 2 + 4 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 19639197 and 19639206.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8968 + ... + 10940.

It is an arithmetic number, because the mean of its divisors is an integer number (1026480).

Almost surely, 2^19639242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19639242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24635520).

19639242 is an abundant number, since it is smaller than the sum of its proper divisors (29631798).

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

19639242 is a wasteful number, since it uses less digits than its factorization.

19639242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2067 (or 2064 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 19639242 is about 4431.6184402541. The cubic root of 19639242 is about 269.7997692420.

It can be divided in two parts, 19639 and 242, that added together give a square (19881 = 141²).

The spelling of 19639242 in words is "nineteen million, six hundred thirty-nine thousand, two hundred forty-two".