816388 has 12 divisors (see below), whose sum is σ = 1446480. Its totient is φ = 403112.

The previous prime is 816377. The next prime is 816401. The reversal of 816388 is 883618.

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, 898 + ... + 1561.

It is an arithmetic number, because the mean of its divisors is an integer number (120540).

2⁸¹⁶³⁸⁸ is an apocalyptic number.

It is an amenable number.

816388 is a deficient number, since it is larger than the sum of its proper divisors (630092).

816388 is a wasteful number, since it uses less digits than its factorization.

816388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546 (or 2544 counting only the distinct ones).

The product of its digits is 9216, while the sum is 34.

The square root of 816388 is about 903.5419193374. The cubic root of 816388 is about 93.4613831969.

The spelling of 816388 in words is "eight hundred sixteen thousand, three hundred eighty-eight".