840309975 has 18 divisors (see below), whose sum is σ = 1505088936. Its totient is φ = 448165200.

The previous prime is 840309973. The next prime is 840309989. The reversal of 840309975 is 579903048.

840309975 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 840309975 - 2¹ = 840309973 is a prime.

It is a super-2 number, since 2×840309975² = 1412241708169001250, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 840309975.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (840309973) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1867131 + ... + 1867580.

It is an arithmetic number, because the mean of its divisors is an integer number (83616052).

Almost surely, 2^840309975 is an apocalyptic number.

840309975 is a deficient number, since it is larger than the sum of its proper divisors (664778961).

840309975 is a wasteful number, since it uses less digits than its factorization.

840309975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3734727 (or 3734719 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The square root of 840309975 is about 28988.1005759260. The cubic root of 840309975 is about 943.6548426783.

The spelling of 840309975 in words is "eight hundred forty million, three hundred nine thousand, nine hundred seventy-five".