840075646 has 4 divisors (see below), whose sum is σ = 1260113472. Its totient is φ = 420037822.

The previous prime is 840075641. The next prime is 840075653. The reversal of 840075646 is 646570048.

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

It is a junction number, because it is equal to n+sod(n) for n = 840075599 and 840075608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840075641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210018910 + ... + 210018913.

It is an arithmetic number, because the mean of its divisors is an integer number (315028368).

Almost surely, 2^840075646 is an apocalyptic number.

840075646 is a deficient number, since it is larger than the sum of its proper divisors (420037826).

840075646 is a wasteful number, since it uses less digits than its factorization.

840075646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 420037825.

The product of its (nonzero) digits is 161280, while the sum is 40.

The square root of 840075646 is about 28984.0584804820. The cubic root of 840075646 is about 943.5671186003.

The spelling of 840075646 in words is "eight hundred forty million, seventy-five thousand, six hundred forty-six".