840081427 has 2 divisors, whose sum is σ = 840081428. Its totient is φ = 840081426.

The previous prime is 840081391. The next prime is 840081433. The reversal of 840081427 is 724180048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840081427 - 2¹¹ = 840079379 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840081392 and 840081401.

It is not a weakly prime, because it can be changed into another prime (840081127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420040713 + 420040714.

It is an arithmetic number, because the mean of its divisors is an integer number (420040714).

Almost surely, 2^840081427 is an apocalyptic number.

840081427 is a deficient number, since it is larger than the sum of its proper divisors (1).

840081427 is an equidigital number, since it uses as much as digits as its factorization.

840081427 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 840081427 is about 28984.1582075450. The cubic root of 840081427 is about 943.5692829884.

The spelling of 840081427 in words is "eight hundred forty million, eighty-one thousand, four hundred twenty-seven".