840253 has 2 divisors, whose sum is σ = 840254. Its totient is φ = 840252.

The previous prime is 840241. The next prime is 840269. The reversal of 840253 is 352048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 458329 + 381924 = 677^2 + 618^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840253 is a prime.

It is a plaindrome in base 13.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420126 + 420127.

It is an arithmetic number, because the mean of its divisors is an integer number (420127).

2⁸⁴⁰²⁵³ is an apocalyptic number.

It is an amenable number.

840253 is a deficient number, since it is larger than the sum of its proper divisors (1).

840253 is an equidigital number, since it uses as much as digits as its factorization.

840253 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 840253 is about 916.6531514155. The cubic root of 840253 is about 94.3633514854.

The spelling of 840253 in words is "eight hundred forty thousand, two hundred fifty-three".