840497293 has 2 divisors, whose sum is σ = 840497294. Its totient is φ = 840497292.

The previous prime is 840497279. The next prime is 840497297. The reversal of 840497293 is 392794048.

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., 459544969 + 380952324 = 21437^2 + 19518^2 .

It is a cyclic number.

It is not a de Polignac number, because 840497293 - 2⁵ = 840497261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840497297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420248646 + 420248647.

It is an arithmetic number, because the mean of its divisors is an integer number (420248647).

Almost surely, 2^840497293 is an apocalyptic number.

It is an amenable number.

840497293 is a deficient number, since it is larger than the sum of its proper divisors (1).

840497293 is an equidigital number, since it uses as much as digits as its factorization.

840497293 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 435456, while the sum is 46.

The square root of 840497293 is about 28991.3313423168. The cubic root of 840497293 is about 943.7249558549.

The spelling of 840497293 in words is "eight hundred forty million, four hundred ninety-seven thousand, two hundred ninety-three".