840878238 has 8 divisors (see below), whose sum is σ = 1681756488. Its totient is φ = 280292744.

The previous prime is 840878237. The next prime is 840878239. The reversal of 840878238 is 832878048.

840878238 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (840878237) and next prime (840878239).

It is a sphenic number, since it is the product of 3 distinct primes.

840878238 is an admirable number.

It is a super-2 number, since 2×840878238² = 1414152422283969288, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840878237) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70073181 + ... + 70073192.

It is an arithmetic number, because the mean of its divisors is an integer number (210219561).

Almost surely, 2^840878238 is an apocalyptic number.

840878238 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840878238 is a wasteful number, since it uses less digits than its factorization.

840878238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140146378.

The product of its (nonzero) digits is 688128, while the sum is 48.

The square root of 840878238 is about 28997.9005791799. The cubic root of 840878238 is about 943.8675115402.

The spelling of 840878238 in words is "eight hundred forty million, eight hundred seventy-eight thousand, two hundred thirty-eight".