19428194 has 4 divisors (see below), whose sum is σ = 29142294. Its totient is φ = 9714096.

The previous prime is 19428193. The next prime is 19428197. The reversal of 19428194 is 49182491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49182491 = 1831 ⋅26861.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 7491169 = 3455^2 + 2737^2 .

It is not an unprimeable number, because it can be changed into a prime (19428193) by changing a digit.

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, 4857047 + ... + 4857050.

Almost surely, 2^19428194 is an apocalyptic number.

19428194 is a deficient number, since it is larger than the sum of its proper divisors (9714100).

19428194 is an equidigital number, since it uses as much as digits as its factorization.

19428194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9714099.

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

The square root of 19428194 is about 4407.7425060908. The cubic root of 19428194 is about 268.8298422231.

The spelling of 19428194 in words is "nineteen million, four hundred twenty-eight thousand, one hundred ninety-four".