19639842 has 8 divisors (see below), whose sum is σ = 39279696. Its totient is φ = 6546612.

The previous prime is 19639831. The next prime is 19639871. The reversal of 19639842 is 24893691.

It is a sphenic number, since it is the product of 3 distinct primes.

19639842 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 19639794 and 19639803.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1636648 + ... + 1636659.

It is an arithmetic number, because the mean of its divisors is an integer number (4909962).

Almost surely, 2^19639842 is an apocalyptic number.

19639842 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

19639842 is a wasteful number, since it uses less digits than its factorization.

19639842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3273312.

The product of its digits is 93312, while the sum is 42.

The square root of 19639842 is about 4431.6861350958. The cubic root of 19639842 is about 269.8025167719.

The spelling of 19639842 in words is "nineteen million, six hundred thirty-nine thousand, eight hundred forty-two".