840289433 has 2 divisors, whose sum is σ = 840289434. Its totient is φ = 840289432.

The previous prime is 840289409. The next prime is 840289451. The reversal of 840289433 is 334982048.

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., 840246169 + 43264 = 28987^2 + 208^2 .

It is a cyclic number.

It is not a de Polignac number, because 840289433 - 2¹⁰ = 840288409 is a prime.

It is a super-2 number, since 2×840289433² = 1412172662422922978, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (840289493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420144716 + 420144717.

It is an arithmetic number, because the mean of its divisors is an integer number (420144717).

Almost surely, 2^840289433 is an apocalyptic number.

It is an amenable number.

840289433 is a deficient number, since it is larger than the sum of its proper divisors (1).

840289433 is an equidigital number, since it uses as much as digits as its factorization.

840289433 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 165888, while the sum is 41.

The square root of 840289433 is about 28987.7462559613. The cubic root of 840289433 is about 943.6471531683.

The spelling of 840289433 in words is "eight hundred forty million, two hundred eighty-nine thousand, four hundred thirty-three".