840838321 has 2 divisors, whose sum is σ = 840838322. Its totient is φ = 840838320.

The previous prime is 840838261. The next prime is 840838333. The reversal of 840838321 is 123838048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 438274225 + 402564096 = 20935^2 + 20064^2 .

It is a cyclic number.

It is not a de Polignac number, because 840838321 - 2¹¹ = 840836273 is a prime.

It is not a weakly prime, because it can be changed into another prime (840838021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420419160 + 420419161.

It is an arithmetic number, because the mean of its divisors is an integer number (420419161).

Almost surely, 2^840838321 is an apocalyptic number.

It is an amenable number.

840838321 is a deficient number, since it is larger than the sum of its proper divisors (1).

840838321 is an equidigital number, since it uses as much as digits as its factorization.

840838321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 840838321 is about 28997.2122970468. The cubic root of 840838321 is about 943.8525759828.

The spelling of 840838321 in words is "eight hundred forty million, eight hundred thirty-eight thousand, three hundred twenty-one".