816391652 has 12 divisors (see below), whose sum is σ = 1445899056. Its totient is φ = 403277640.

The previous prime is 816391651. The next prime is 816391657. The reversal of 816391652 is 256193618.

It is not an unprimeable number, because it can be changed into a prime (816391651) 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 3 ways as a sum of consecutive naturals, for example, 1229174 + ... + 1229837.

It is an arithmetic number, because the mean of its divisors is an integer number (120491588).

Almost surely, 2^816391652 is an apocalyptic number.

It is an amenable number.

816391652 is a deficient number, since it is larger than the sum of its proper divisors (629507404).

816391652 is a wasteful number, since it uses less digits than its factorization.

816391652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459098 (or 2459096 counting only the distinct ones).

The product of its digits is 77760, while the sum is 41.

The square root of 816391652 is about 28572.5681729872. The cubic root of 816391652 is about 934.6152255895.

The spelling of 816391652 in words is "eight hundred sixteen million, three hundred ninety-one thousand, six hundred fifty-two".