816895385 has 4 divisors (see below), whose sum is σ = 980274468. Its totient is φ = 653516304.

The previous prime is 816895351. The next prime is 816895397. The reversal of 816895385 is 583598618.

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 619661449 + 197233936 = 24893^2 + 14044^2 .

It is a cyclic number.

It is not a de Polignac number, because 816895385 - 2²² = 812701081 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81689534 + ... + 81689543.

It is an arithmetic number, because the mean of its divisors is an integer number (245068617).

Almost surely, 2^816895385 is an apocalyptic number.

It is an amenable number.

816895385 is a deficient number, since it is larger than the sum of its proper divisors (163379083).

816895385 is a wasteful number, since it uses less digits than its factorization.

816895385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163379082.

The product of its digits is 2073600, while the sum is 53.

The square root of 816895385 is about 28581.3817895496. The cubic root of 816895385 is about 934.8074126493.

The spelling of 816895385 in words is "eight hundred sixteen million, eight hundred ninety-five thousand, three hundred eighty-five".