19659042 has 48 divisors (see below), whose sum is σ = 47469240. Its totient is φ = 5838336.

The previous prime is 19658999. The next prime is 19659067. The reversal of 19659042 is 24095691.

It can be written as a sum of positive squares in 4 ways, for example, as 9603801 + 10055241 = 3099^2 + 3171^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19658988 and 19659006.

It is a congruent number.

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 23 ways as a sum of consecutive naturals, for example, 5338 + ... + 8234.

Almost surely, 2^19659042 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19659042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23734620).

19659042 is an abundant number, since it is smaller than the sum of its proper divisors (27810198).

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

19659042 is a wasteful number, since it uses less digits than its factorization.

19659042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947 (or 2944 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 19659042 is about 4433.8518243171. The cubic root of 19659042 is about 269.8904081981.

The spelling of 19659042 in words is "nineteen million, six hundred fifty-nine thousand, forty-two".