840994608973 has 2 divisors, whose sum is σ = 840994608974. Its totient is φ = 840994608972.

The previous prime is 840994608911. The next prime is 840994609001. The reversal of 840994608973 is 379806499048.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 762752449449 + 78242159524 = 873357^2 + 279718^2 .

It is a cyclic number.

It is not a de Polignac number, because 840994608973 - 2¹³ = 840994600781 is a prime.

It is a super-2 number, since 2×840994608973² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840994608899 and 840994608908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840994608673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420497304486 + 420497304487.

It is an arithmetic number, because the mean of its divisors is an integer number (420497304487).

Almost surely, 2^840994608973 is an apocalyptic number.

It is an amenable number.

840994608973 is a deficient number, since it is larger than the sum of its proper divisors (1).

840994608973 is an equidigital number, since it uses as much as digits as its factorization.

840994608973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 94058496, while the sum is 67.

The spelling of 840994608973 in words is "eight hundred forty billion, nine hundred ninety-four million, six hundred eight thousand, nine hundred seventy-three".