840441479 has 2 divisors, whose sum is σ = 840441480. Its totient is φ = 840441478.

The previous prime is 840441449. The next prime is 840441487. The reversal of 840441479 is 974144048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840441479 - 2¹² = 840437383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840441409) 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 as a sum of consecutive naturals, namely, 420220739 + 420220740.

It is an arithmetic number, because the mean of its divisors is an integer number (420220740).

Almost surely, 2^840441479 is an apocalyptic number.

840441479 is a deficient number, since it is larger than the sum of its proper divisors (1).

840441479 is an equidigital number, since it uses as much as digits as its factorization.

840441479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 840441479 is about 28990.3687282518. The cubic root of 840441479 is about 943.7040657496.

The spelling of 840441479 in words is "eight hundred forty million, four hundred forty-one thousand, four hundred seventy-nine".