840078023 has 4 divisors (see below), whose sum is σ = 840482640. Its totient is φ = 839673408.

The previous prime is 840078017. The next prime is 840078067. The reversal of 840078023 is 320870048.

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 840078023 - 2⁸ = 840077767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840078223) 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, 199178 + ... + 203351.

It is an arithmetic number, because the mean of its divisors is an integer number (210120660).

Almost surely, 2^840078023 is an apocalyptic number.

840078023 is a deficient number, since it is larger than the sum of its proper divisors (404617).

840078023 is a wasteful number, since it uses less digits than its factorization.

840078023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404616.

The product of its (nonzero) digits is 10752, while the sum is 32.

The square root of 840078023 is about 28984.0994857525. The cubic root of 840078023 is about 943.5680085428.

The spelling of 840078023 in words is "eight hundred forty million, seventy-eight thousand, twenty-three".