840661423289 has 8 divisors (see below), whose sum is σ = 880127458560. Its totient is φ = 801893902096.

The previous prime is 840661423279. The next prime is 840661423319. The reversal of 840661423289 is 982324166048.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 840661423289 - 2²⁰ = 840660374713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 840661423289.

It is not an unprimeable number, because it can be changed into a prime (840661423279) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 174626057 + ... + 174630870.

It is an arithmetic number, because the mean of its divisors is an integer number (110015932320).

Almost surely, 2^840661423289 is an apocalyptic number.

It is an amenable number.

840661423289 is a deficient number, since it is larger than the sum of its proper divisors (39466035271).

840661423289 is a wasteful number, since it uses less digits than its factorization.

840661423289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349257039.

The product of its (nonzero) digits is 3981312, while the sum is 53.

The spelling of 840661423289 in words is "eight hundred forty billion, six hundred sixty-one million, four hundred twenty-three thousand, two hundred eighty-nine".