840928469 has 2 divisors, whose sum is σ = 840928470. Its totient is φ = 840928468.

The previous prime is 840928433. The next prime is 840928471. The reversal of 840928469 is 964829048.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840420100 + 508369 = 28990^2 + 713^2 .

It is a cyclic number.

It is not a de Polignac number, because 840928469 - 2¹² = 840924373 is a prime.

It is a super-2 number, since 2×840928469² = 1414321379949367922, which contains 22 as substring.

Together with 840928471, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840928499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420464234 + 420464235.

It is an arithmetic number, because the mean of its divisors is an integer number (420464235).

Almost surely, 2^840928469 is an apocalyptic number.

It is an amenable number.

840928469 is a deficient number, since it is larger than the sum of its proper divisors (1).

840928469 is an equidigital number, since it uses as much as digits as its factorization.

840928469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 995328, while the sum is 50.

The square root of 840928469 is about 28998.7666806711. The cubic root of 840928469 is about 943.8863055672.

The spelling of 840928469 in words is "eight hundred forty million, nine hundred twenty-eight thousand, four hundred sixty-nine".