19842473 has 4 divisors (see below), whose sum is σ = 22677120. Its totient is φ = 17007828.

The previous prime is 19842463. The next prime is 19842499. The reversal of 19842473 is 37424891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37424891 = 7 ⋅5346413.

It is a cyclic number.

It is not a de Polignac number, because 19842473 - 2⁸ = 19842217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19842443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417313 + ... + 1417326.

It is an arithmetic number, because the mean of its divisors is an integer number (5669280).

Almost surely, 2^19842473 is an apocalyptic number.

It is an amenable number.

19842473 is a deficient number, since it is larger than the sum of its proper divisors (2834647).

19842473 is an equidigital number, since it uses as much as digits as its factorization.

19842473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2834646.

The product of its digits is 48384, while the sum is 38.

The square root of 19842473 is about 4454.4890840589. The cubic root of 19842473 is about 270.7272256112.

The spelling of 19842473 in words is "nineteen million, eight hundred forty-two thousand, four hundred seventy-three".