840385319 has 2 divisors, whose sum is σ = 840385320. Its totient is φ = 840385318.

The previous prime is 840385309. The next prime is 840385373. The reversal of 840385319 is 913583048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840385319 - 2⁴ = 840385303 is a prime.

It is a super-2 number, since 2×840385319² = 1412494968781463522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840385309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420192659 + 420192660.

It is an arithmetic number, because the mean of its divisors is an integer number (420192660).

Almost surely, 2^840385319 is an apocalyptic number.

840385319 is a deficient number, since it is larger than the sum of its proper divisors (1).

840385319 is an equidigital number, since it uses as much as digits as its factorization.

840385319 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 103680, while the sum is 41.

The square root of 840385319 is about 28989.4001145246. The cubic root of 840385319 is about 943.6830452098.

The spelling of 840385319 in words is "eight hundred forty million, three hundred eighty-five thousand, three hundred nineteen".