840765745 has 8 divisors (see below), whose sum is σ = 1025458920. Its totient is φ = 661585920.

The previous prime is 840765743. The next prime is 840765817. The reversal of 840765745 is 547567048.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 28686736 + 812079009 = 5356^2 + 28497^2 .

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

It is not a de Polignac number, because 840765745 - 2¹ = 840765743 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 840765695 and 840765704.

It is not an unprimeable number, because it can be changed into a prime (840765743) 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, 1378000 + ... + 1378609.

It is an arithmetic number, because the mean of its divisors is an integer number (128182365).

Almost surely, 2^840765745 is an apocalyptic number.

It is an amenable number.

840765745 is a deficient number, since it is larger than the sum of its proper divisors (184693175).

840765745 is a wasteful number, since it uses less digits than its factorization.

840765745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2756675.

The product of its (nonzero) digits is 940800, while the sum is 46.

The square root of 840765745 is about 28995.9608393997. The cubic root of 840765745 is about 943.8254193488.

The spelling of 840765745 in words is "eight hundred forty million, seven hundred sixty-five thousand, seven hundred forty-five".