19798442 has 4 divisors (see below), whose sum is σ = 29697666. Its totient is φ = 9899220.

The previous prime is 19798439. The next prime is 19798451. The reversal of 19798442 is 24489791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24489791 = 127 ⋅192833.

It can be written as a sum of positive squares in only one way, i.e., 12823561 + 6974881 = 3581^2 + 2641^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19798393 and 19798402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4949609 + ... + 4949612.

Almost surely, 2^19798442 is an apocalyptic number.

19798442 is a deficient number, since it is larger than the sum of its proper divisors (9899224).

19798442 is an equidigital number, since it uses as much as digits as its factorization.

19798442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9899223.

The product of its digits is 145152, while the sum is 44.

The square root of 19798442 is about 4449.5440215824. The cubic root of 19798442 is about 270.5268268910.

The spelling of 19798442 in words is "nineteen million, seven hundred ninety-eight thousand, four hundred forty-two".