840925766 has 4 divisors (see below), whose sum is σ = 1261388652. Its totient is φ = 420462882.

The previous prime is 840925721. The next prime is 840925783. The reversal of 840925766 is 667529048.

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

It is a super-2 number, since 2×840925766² = 1414312287845373512, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 840925766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210231440 + ... + 210231443.

It is an arithmetic number, because the mean of its divisors is an integer number (315347163).

Almost surely, 2^840925766 is an apocalyptic number.

840925766 is a deficient number, since it is larger than the sum of its proper divisors (420462886).

840925766 is a wasteful number, since it uses less digits than its factorization.

840925766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420462885.

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 840925766 is about 28998.7200752033. The cubic root of 840925766 is about 943.8852942535.

The spelling of 840925766 in words is "eight hundred forty million, nine hundred twenty-five thousand, seven hundred sixty-six".