840642619 has 2 divisors, whose sum is σ = 840642620. Its totient is φ = 840642618.

The previous prime is 840642601. The next prime is 840642623. The reversal of 840642619 is 916246048.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840642619 - 2⁹ = 840642107 is a prime.

It is a super-2 number, since 2×840642619² = 1413360025758358322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (840642629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420321309 + 420321310.

It is an arithmetic number, because the mean of its divisors is an integer number (420321310).

Almost surely, 2^840642619 is an apocalyptic number.

840642619 is a deficient number, since it is larger than the sum of its proper divisors (1).

840642619 is an equidigital number, since it uses as much as digits as its factorization.

840642619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 840642619 is about 28993.8376038771. The cubic root of 840642619 is about 943.7793442391.

The spelling of 840642619 in words is "eight hundred forty million, six hundred forty-two thousand, six hundred nineteen".