815985375 has 64 divisors (see below), whose sum is σ = 1434101760. Its totient is φ = 411206400.

The previous prime is 815985361. The next prime is 815985389. The reversal of 815985375 is 573589518.

It is an interprime number because it is at equal distance from previous prime (815985361) and next prime (815985389).

It is not a de Polignac number, because 815985375 - 2⁶ = 815985311 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 767094 + ... + 768156.

It is an arithmetic number, because the mean of its divisors is an integer number (22407840).

Almost surely, 2^815985375 is an apocalyptic number.

815985375 is a deficient number, since it is larger than the sum of its proper divisors (618116385).

815985375 is a wasteful number, since it uses less digits than its factorization.

815985375 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193 (or 1183 counting only the distinct ones).

The product of its digits is 1512000, while the sum is 51.

The square root of 815985375 is about 28565.4577243215. The cubic root of 815985375 is about 934.4601628920.

The spelling of 815985375 in words is "eight hundred fifteen million, nine hundred eighty-five thousand, three hundred seventy-five".