840040793 has 4 divisors (see below), whose sum is σ = 840372900. Its totient is φ = 839708688.

The previous prime is 840040781. The next prime is 840040847. The reversal of 840040793 is 397040048.

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 820077769 + 19963024 = 28637^2 + 4468^2 .

It is a cyclic number.

It is not a de Polignac number, because 840040793 - 2²⁸ = 571605337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (840045793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162230 + ... + 167327.

It is an arithmetic number, because the mean of its divisors is an integer number (210093225).

Almost surely, 2^840040793 is an apocalyptic number.

It is an amenable number.

840040793 is a deficient number, since it is larger than the sum of its proper divisors (332107).

840040793 is a wasteful number, since it uses less digits than its factorization.

840040793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332106.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 840040793 is about 28983.4572299441. The cubic root of 840040793 is about 943.5540695375.

The spelling of 840040793 in words is "eight hundred forty million, forty thousand, seven hundred ninety-three".