19819442 has 8 divisors (see below), whose sum is σ = 29789100. Its totient is φ = 9889744.

The previous prime is 19819421. The next prime is 19819453. The reversal of 19819442 is 24491891.

It can be written as a sum of positive squares in 2 ways, for example, as 19616041 + 203401 = 4429^2 + 451^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 19819396 and 19819405.

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, 8717 + ... + 10752.

Almost surely, 2^19819442 is an apocalyptic number.

19819442 is a deficient number, since it is larger than the sum of its proper divisors (9969658).

19819442 is a wasteful number, since it uses less digits than its factorization.

19819442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19980.

The product of its digits is 20736, while the sum is 38.

The square root of 19819442 is about 4451.9031885251. The cubic root of 19819442 is about 270.6224414168.

The spelling of 19819442 in words is "nineteen million, eight hundred nineteen thousand, four hundred forty-two".