840240773 has 2 divisors, whose sum is σ = 840240774. Its totient is φ = 840240772.

The previous prime is 840240749. The next prime is 840240803. The reversal of 840240773 is 377042048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 561784804 + 278455969 = 23702^2 + 16687^2 .

It is a cyclic number.

It is not a de Polignac number, because 840240773 - 2²⁰ = 839192197 is a prime.

It is a super-2 number, since 2×840240773² = 1412009113223275058, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840240073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420120386 + 420120387.

It is an arithmetic number, because the mean of its divisors is an integer number (420120387).

Almost surely, 2^840240773 is an apocalyptic number.

It is an amenable number.

840240773 is a deficient number, since it is larger than the sum of its proper divisors (1).

840240773 is an equidigital number, since it uses as much as digits as its factorization.

840240773 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 37632, while the sum is 35.

The square root of 840240773 is about 28986.9069236440. The cubic root of 840240773 is about 943.6289377158.

The spelling of 840240773 in words is "eight hundred forty million, two hundred forty thousand, seven hundred seventy-three".