842281387 has 2 divisors, whose sum is σ = 842281388. Its totient is φ = 842281386.

The previous prime is 842281369. The next prime is 842281393. The reversal of 842281387 is 783182248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842281387 - 2¹⁵ = 842248619 is a prime.

It is not a weakly prime, because it can be changed into another prime (842281397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421140693 + 421140694.

It is an arithmetic number, because the mean of its divisors is an integer number (421140694).

Almost surely, 2^842281387 is an apocalyptic number.

842281387 is a deficient number, since it is larger than the sum of its proper divisors (1).

842281387 is an equidigital number, since it uses as much as digits as its factorization.

842281387 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172032, while the sum is 43.

The square root of 842281387 is about 29022.0844702788. The cubic root of 842281387 is about 944.3922211918.

The spelling of 842281387 in words is "eight hundred forty-two million, two hundred eighty-one thousand, three hundred eighty-seven".