19946042 has 4 divisors (see below), whose sum is σ = 29919066. Its totient is φ = 9973020.

The previous prime is 19946033. The next prime is 19946063. The reversal of 19946042 is 24064991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24064991 = 41 ⋅586951.

It can be written as a sum of positive squares in only one way, i.e., 16556761 + 3389281 = 4069^2 + 1841^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19945993 and 19946011.

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, 4986509 + ... + 4986512.

Almost surely, 2^19946042 is an apocalyptic number.

19946042 is a deficient number, since it is larger than the sum of its proper divisors (9973024).

19946042 is an equidigital number, since it uses as much as digits as its factorization.

19946042 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9973023.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 19946042 is about 4466.0991928080. The cubic root of 19946042 is about 271.1974342277.

The spelling of 19946042 in words is "nineteen million, nine hundred forty-six thousand, forty-two".