840427451 has 2 divisors, whose sum is σ = 840427452. Its totient is φ = 840427450.

The previous prime is 840427421. The next prime is 840427457. The reversal of 840427451 is 154724048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840427451 - 2¹⁴ = 840411067 is a prime.

It is not a weakly prime, because it can be changed into another prime (840427457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420213725 + 420213726.

It is an arithmetic number, because the mean of its divisors is an integer number (420213726).

Almost surely, 2^840427451 is an apocalyptic number.

840427451 is a deficient number, since it is larger than the sum of its proper divisors (1).

840427451 is an equidigital number, since it uses as much as digits as its factorization.

840427451 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 35840, while the sum is 35.

The square root of 840427451 is about 28990.1267848211. The cubic root of 840427451 is about 943.6988151940.

The spelling of 840427451 in words is "eight hundred forty million, four hundred twenty-seven thousand, four hundred fifty-one".