840487317 has 4 divisors (see below), whose sum is σ = 1120649760. Its totient is φ = 560324876.

The previous prime is 840487289. The next prime is 840487339. The reversal of 840487317 is 713784048.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 840487317 - 2¹⁴ = 840470933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840487387) by changing a digit.

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, 140081217 + ... + 140081222.

It is an arithmetic number, because the mean of its divisors is an integer number (280162440).

Almost surely, 2^840487317 is an apocalyptic number.

It is an amenable number.

840487317 is a deficient number, since it is larger than the sum of its proper divisors (280162443).

840487317 is a wasteful number, since it uses less digits than its factorization.

840487317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280162442.

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 840487317 is about 28991.1592903768. The cubic root of 840487317 is about 943.7212220981.

The spelling of 840487317 in words is "eight hundred forty million, four hundred eighty-seven thousand, three hundred seventeen".