840441487 has 2 divisors, whose sum is σ = 840441488. Its totient is φ = 840441486.

The previous prime is 840441479. The next prime is 840441521. The reversal of 840441487 is 784144048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840441487 - 2³ = 840441479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840441187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420220743 + 420220744.

It is an arithmetic number, because the mean of its divisors is an integer number (420220744).

Almost surely, 2^840441487 is an apocalyptic number.

840441487 is a deficient number, since it is larger than the sum of its proper divisors (1).

840441487 is an equidigital number, since it uses as much as digits as its factorization.

840441487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 114688, while the sum is 40.

The square root of 840441487 is about 28990.3688662287. The cubic root of 840441487 is about 943.7040687440.

The spelling of 840441487 in words is "eight hundred forty million, four hundred forty-one thousand, four hundred eighty-seven".