840492688345 has 4 divisors (see below), whose sum is σ = 1008591226020. Its totient is φ = 672394150672.

The previous prime is 840492688333. The next prime is 840492688363. The reversal of 840492688345 is 543886294048.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 194290534656 + 646202153689 = 440784^2 + 803867^2 .

It is a cyclic number.

It is not a de Polignac number, because 840492688345 - 2³⁵ = 806132949977 is a prime.

It is a super-2 number, since 2×840492688345² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 84049268830 + ... + 84049268839.

It is an arithmetic number, because the mean of its divisors is an integer number (252147806505).

Almost surely, 2^840492688345 is an apocalyptic number.

It is an amenable number.

840492688345 is a deficient number, since it is larger than the sum of its proper divisors (168098537675).

840492688345 is a wasteful number, since it uses less digits than its factorization.

840492688345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168098537674.

The product of its (nonzero) digits is 53084160, while the sum is 61.

The spelling of 840492688345 in words is "eight hundred forty billion, four hundred ninety-two million, six hundred eighty-eight thousand, three hundred forty-five".