840732769 has 4 divisors (see below), whose sum is σ = 848172996. Its totient is φ = 833292544.

The previous prime is 840732727. The next prime is 840732791. The reversal of 840732769 is 967237048.

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 160149025 + 680583744 = 12655^2 + 26088^2 .

It is a cyclic number.

It is not a de Polignac number, because 840732769 - 2⁹ = 840732257 is a prime.

It is a super-2 number, since 2×840732769² = 1413663177740814722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840732169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3719944 + ... + 3720169.

It is an arithmetic number, because the mean of its divisors is an integer number (212043249).

Almost surely, 2^840732769 is an apocalyptic number.

It is an amenable number.

840732769 is a deficient number, since it is larger than the sum of its proper divisors (7440227).

840732769 is a wasteful number, since it uses less digits than its factorization.

840732769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7440226.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 840732769 is about 28995.3922029001. The cubic root of 840732769 is about 943.8130798063.

The spelling of 840732769 in words is "eight hundred forty million, seven hundred thirty-two thousand, seven hundred sixty-nine".