839840387 has 2 divisors, whose sum is σ = 839840388. Its totient is φ = 839840386.

The previous prime is 839840371. The next prime is 839840429. The reversal of 839840387 is 783048938.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 839840387 - 2⁴ = 839840371 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (839840357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419920193 + 419920194.

It is an arithmetic number, because the mean of its divisors is an integer number (419920194).

Almost surely, 2^839840387 is an apocalyptic number.

839840387 is a deficient number, since it is larger than the sum of its proper divisors (1).

839840387 is an equidigital number, since it uses as much as digits as its factorization.

839840387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 839840387 is about 28979.9997757074. Note that the first 3 decimals coincide. The cubic root of 839840387 is about 943.4790299531.

The spelling of 839840387 in words is "eight hundred thirty-nine million, eight hundred forty thousand, three hundred eighty-seven".