840250509 has 16 divisors (see below), whose sum is σ = 1347770880. Its totient is φ = 454872240.

The previous prime is 840250459. The next prime is 840250511. The reversal of 840250509 is 905052048.

It is not a de Polignac number, because 840250509 - 2²⁰ = 839201933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840250509.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840250549) 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 15 ways as a sum of consecutive naturals, for example, 1052547 + ... + 1053344.

It is an arithmetic number, because the mean of its divisors is an integer number (84235680).

Almost surely, 2^840250509 is an apocalyptic number.

It is an amenable number.

840250509 is a deficient number, since it is larger than the sum of its proper divisors (507520371).

840250509 is a wasteful number, since it uses less digits than its factorization.

840250509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105920.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 840250509 is about 28987.0748610480. The cubic root of 840250509 is about 943.6325823599.

The spelling of 840250509 in words is "eight hundred forty million, two hundred fifty thousand, five hundred nine".