816983905 has 8 divisors (see below), whose sum is σ = 980553600. Its totient is φ = 653471856.

The previous prime is 816983903. The next prime is 816983929. The reversal of 816983905 is 509389618.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 816983905 - 2¹ = 816983903 is a prime.

It is not an unprimeable number, because it can be changed into a prime (816983903) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28266 + ... + 49324.

It is an arithmetic number, because the mean of its divisors is an integer number (122569200).

Almost surely, 2^816983905 is an apocalyptic number.

It is an amenable number.

816983905 is a deficient number, since it is larger than the sum of its proper divisors (163569695).

816983905 is a wasteful number, since it uses less digits than its factorization.

816983905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28823.

The product of its (nonzero) digits is 466560, while the sum is 49.

The square root of 816983905 is about 28582.9303081402. The cubic root of 816983905 is about 934.8411771374.

The spelling of 816983905 in words is "eight hundred sixteen million, nine hundred eighty-three thousand, nine hundred five".