19000642 has 4 divisors (see below), whose sum is σ = 28500966. Its totient is φ = 9500320.

The previous prime is 19000637. The next prime is 19000661. The reversal of 19000642 is 24600091.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 11553201 + 7447441 = 3399^2 + 2729^2 .

It is a super-2 number, since 2×19000642² = 722048792824328, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 4750159 + ... + 4750162.

Almost surely, 2^19000642 is an apocalyptic number.

19000642 is a deficient number, since it is larger than the sum of its proper divisors (9500324).

19000642 is an equidigital number, since it uses as much as digits as its factorization.

19000642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9500323.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 19000642 is about 4358.9725853692. The cubic root of 19000642 is about 266.8431703013.

The spelling of 19000642 in words is "nineteen million, six hundred forty-two", and thus it is an aban number.