842609387 has 2 divisors, whose sum is σ = 842609388. Its totient is φ = 842609386.

The previous prime is 842609377. The next prime is 842609389. The reversal of 842609387 is 783906248.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 842609387 - 2⁴ = 842609371 is a prime.

Together with 842609389, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (842609389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421304693 + 421304694.

It is an arithmetic number, because the mean of its divisors is an integer number (421304694).

Almost surely, 2^842609387 is an apocalyptic number.

842609387 is a deficient number, since it is larger than the sum of its proper divisors (1).

842609387 is an equidigital number, since it uses as much as digits as its factorization.

842609387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 580608, while the sum is 47.

The square root of 842609387 is about 29027.7347893355. The cubic root of 842609387 is about 944.5147932337.

The spelling of 842609387 in words is "eight hundred forty-two million, six hundred nine thousand, three hundred eighty-seven".