840470561 has 8 divisors (see below), whose sum is σ = 982876224. Its totient is φ = 703649520.

The previous prime is 840470539. The next prime is 840470563. The reversal of 840470561 is 165074048.

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

It is a de Polignac number, because none of the positive numbers 2^k-840470561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840470563) 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, 1395830 + ... + 1396431.

It is an arithmetic number, because the mean of its divisors is an integer number (122859528).

Almost surely, 2^840470561 is an apocalyptic number.

It is an amenable number.

840470561 is a deficient number, since it is larger than the sum of its proper divisors (142405663).

840470561 is a wasteful number, since it uses less digits than its factorization.

840470561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2792311.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 840470561 is about 28990.8703042872. The cubic root of 840470561 is about 943.7149506975.

The spelling of 840470561 in words is "eight hundred forty million, four hundred seventy thousand, five hundred sixty-one".