840738853 has 2 divisors, whose sum is σ = 840738854. Its totient is φ = 840738852.

The previous prime is 840738851. The next prime is 840738887. The reversal of 840738853 is 358837048.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 462164004 + 378574849 = 21498^2 + 19457^2 .

It is a cyclic number.

It is not a de Polignac number, because 840738853 - 2¹ = 840738851 is a prime.

It is a super-3 number, since 3×840738853³ (a number of 28 digits) contains 333 as substring.

Together with 840738851, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840738851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420369426 + 420369427.

It is an arithmetic number, because the mean of its divisors is an integer number (420369427).

Almost surely, 2^840738853 is an apocalyptic number.

It is an amenable number.

840738853 is a deficient number, since it is larger than the sum of its proper divisors (1).

840738853 is an equidigital number, since it uses as much as digits as its factorization.

840738853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 645120, while the sum is 46.

The square root of 840738853 is about 28995.4971159316. The cubic root of 840738853 is about 943.8153564492.

The spelling of 840738853 in words is "eight hundred forty million, seven hundred thirty-eight thousand, eight hundred fifty-three".