840269 has 2 divisors, whose sum is σ = 840270. Its totient is φ = 840268.

The previous prime is 840253. The next prime is 840277. The reversal of 840269 is 962048.

840269 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 619369 + 220900 = 787^2 + 470^2 .

It is a cyclic number.

It is not a de Polignac number, because 840269 - 2⁴ = 840253 is a prime.

It is a super-2 number, since 2×840269² = 1412103984722, 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 (840239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420134 + 420135.

It is an arithmetic number, because the mean of its divisors is an integer number (420135).

2⁸⁴⁰²⁶⁹ is an apocalyptic number.

It is an amenable number.

840269 is a deficient number, since it is larger than the sum of its proper divisors (1).

840269 is an equidigital number, since it uses as much as digits as its factorization.

840269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 840269 is about 916.6618787754. The cubic root of 840269 is about 94.3639504336.

The spelling of 840269 in words is "eight hundred forty thousand, two hundred sixty-nine".