840391441 has 8 divisors (see below), whose sum is σ = 861602720. Its totient is φ = 819256032.

The previous prime is 840391427. The next prime is 840391463. The reversal of 840391441 is 144193048.

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

It is a cyclic number.

It is not a de Polignac number, because 840391441 - 2¹¹ = 840389393 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 840391397 and 840391406.

It is not an unprimeable number, because it can be changed into a prime (840391421) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3805 + ... + 41173.

It is an arithmetic number, because the mean of its divisors is an integer number (107700340).

Almost surely, 2^840391441 is an apocalyptic number.

It is an amenable number.

840391441 is a deficient number, since it is larger than the sum of its proper divisors (21211279).

840391441 is a wasteful number, since it uses less digits than its factorization.

840391441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37935.

The product of its (nonzero) digits is 13824, while the sum is 34.

The square root of 840391441 is about 28989.5057046511. The cubic root of 840391441 is about 943.6853367037.

The spelling of 840391441 in words is "eight hundred forty million, three hundred ninety-one thousand, four hundred forty-one".