840289019 has 4 divisors (see below), whose sum is σ = 843413040. Its totient is φ = 837165000.

The previous prime is 840288991. The next prime is 840289027. The reversal of 840289019 is 910982048.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840289019 is a prime.

It is a super-2 number, since 2×840289019² = 1412171270903964722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840289049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1561607 + ... + 1562144.

It is an arithmetic number, because the mean of its divisors is an integer number (210853260).

Almost surely, 2^840289019 is an apocalyptic number.

840289019 is a deficient number, since it is larger than the sum of its proper divisors (3124021).

840289019 is a wasteful number, since it uses less digits than its factorization.

840289019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3124020.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 840289019 is about 28987.7391150121. The cubic root of 840289019 is about 943.6469981939.

The spelling of 840289019 in words is "eight hundred forty million, two hundred eighty-nine thousand, nineteen".