42389819 has 4 divisors (see below), whose sum is σ = 42429696. Its totient is φ = 42349944.

The previous prime is 42389797. The next prime is 42389833. The reversal of 42389819 is 91898324.

It is a happy number.

42389819 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42389819 - 2¹⁶ = 42324283 is a prime.

It is a super-2 number, since 2×42389819² = 3593793509705522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42389819.

It is not an unprimeable number, because it can be changed into a prime (42389839) 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, 18299 + ... + 20484.

It is an arithmetic number, because the mean of its divisors is an integer number (10607424).

Almost surely, 2^42389819 is an apocalyptic number.

42389819 is a deficient number, since it is larger than the sum of its proper divisors (39877).

42389819 is a wasteful number, since it uses less digits than its factorization.

42389819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39876.

The product of its digits is 124416, while the sum is 44.

The square root of 42389819 is about 6510.7464241821. The cubic root of 42389819 is about 348.6747680976.

The spelling of 42389819 in words is "forty-two million, three hundred eighty-nine thousand, eight hundred nineteen".