19845142 has 4 divisors (see below), whose sum is σ = 29767716. Its totient is φ = 9922570.

The previous prime is 19845127. The next prime is 19845143. The reversal of 19845142 is 24154891.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 24154891 = 4391 ⋅5501.

It is a super-2 number, since 2×19845142² = 787659322000328, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 19845098 and 19845107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19845143) 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, 4961284 + ... + 4961287.

It is an arithmetic number, because the mean of its divisors is an integer number (7441929).

Almost surely, 2^19845142 is an apocalyptic number.

19845142 is a deficient number, since it is larger than the sum of its proper divisors (9922574).

19845142 is an equidigital number, since it uses as much as digits as its factorization.

19845142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9922573.

The product of its digits is 11520, while the sum is 34.

The square root of 19845142 is about 4454.7886594091. The cubic root of 19845142 is about 270.7393635231.

The spelling of 19845142 in words is "nineteen million, eight hundred forty-five thousand, one hundred forty-two".