840925765 has 4 divisors (see below), whose sum is σ = 1009110924. Its totient is φ = 672740608.

The previous prime is 840925721. The next prime is 840925783. The reversal of 840925765 is 567529048.

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

It can be written as a sum of positive squares in 2 ways, for example, as 666104481 + 174821284 = 25809^2 + 13222^2 .

It is a cyclic number.

It is not a de Polignac number, because 840925765 - 2⁷ = 840925637 is a prime.

It is a super-2 number, since 2×840925765² = 1414312284481670450, which contains 22 as substring.

It is a Duffinian number.

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 in 3 ways as a sum of consecutive naturals, for example, 84092572 + ... + 84092581.

It is an arithmetic number, because the mean of its divisors is an integer number (252277731).

Almost surely, 2^840925765 is an apocalyptic number.

It is an amenable number.

840925765 is a deficient number, since it is larger than the sum of its proper divisors (168185159).

840925765 is a wasteful number, since it uses less digits than its factorization.

840925765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168185158.

The product of its (nonzero) digits is 604800, while the sum is 46.

The square root of 840925765 is about 28998.7200579612. The cubic root of 840925765 is about 943.8852938794.

The spelling of 840925765 in words is "eight hundred forty million, nine hundred twenty-five thousand, seven hundred sixty-five".