840406667 has 8 divisors (see below), whose sum is σ = 844207056. Its totient is φ = 836613792.

The previous prime is 840406529. The next prime is 840406687. The reversal of 840406667 is 766604048.

840406667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 840406667 - 2²⁴ = 823629451 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840406687) 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, 378653 + ... + 380865.

It is an arithmetic number, because the mean of its divisors is an integer number (105525882).

Almost surely, 2^840406667 is an apocalyptic number.

840406667 is a deficient number, since it is larger than the sum of its proper divisors (3800389).

840406667 is a wasteful number, since it uses less digits than its factorization.

840406667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3757.

The product of its (nonzero) digits is 193536, while the sum is 41.

The square root of 840406667 is about 28989.7683157351. The cubic root of 840406667 is about 943.6910358202.

The spelling of 840406667 in words is "eight hundred forty million, four hundred six thousand, six hundred sixty-seven".