840212817377 has 4 divisors (see below), whose sum is σ = 840219635760. Its totient is φ = 840205998996.

The previous prime is 840212817373. The next prime is 840212817383. The reversal of 840212817377 is 773718212048.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 840212817377 - 2² = 840212817373 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840212817371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3220883 + ... + 3471960.

It is an arithmetic number, because the mean of its divisors is an integer number (210054908940).

Almost surely, 2^840212817377 is an apocalyptic number.

It is an amenable number.

840212817377 is a deficient number, since it is larger than the sum of its proper divisors (6818383).

840212817377 is a wasteful number, since it uses less digits than its factorization.

840212817377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6818382.

The product of its (nonzero) digits is 1053696, while the sum is 50.

The spelling of 840212817377 in words is "eight hundred forty billion, two hundred twelve million, eight hundred seventeen thousand, three hundred seventy-seven".