840072269 has 2 divisors, whose sum is σ = 840072270. Its totient is φ = 840072268.

The previous prime is 840072253. The next prime is 840072307. The reversal of 840072269 is 962270048.

It is an a-pointer prime, because the next prime (840072307) can be obtained adding 840072269 to its sum of digits (38).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 494484169 + 345588100 = 22237^2 + 18590^2 .

It is a cyclic number.

It is not a de Polignac number, because 840072269 - 2⁴ = 840072253 is a prime.

It is a super-2 number, since 2×840072269² = 1411442834285616722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840072469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420036134 + 420036135.

It is an arithmetic number, because the mean of its divisors is an integer number (420036135).

Almost surely, 2^840072269 is an apocalyptic number.

It is an amenable number.

840072269 is a deficient number, since it is larger than the sum of its proper divisors (1).

840072269 is an equidigital number, since it uses as much as digits as its factorization.

840072269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 840072269 is about 28984.0002242617. Note that the first 3 decimals coincide. The cubic root of 840072269 is about 943.5658542577.

The spelling of 840072269 in words is "eight hundred forty million, seventy-two thousand, two hundred sixty-nine".