816622 has 4 divisors (see below), whose sum is σ = 1224936. Its totient is φ = 408310.

The previous prime is 816593. The next prime is 816649. The reversal of 816622 is 226618.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

816622 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 204154 + ... + 204157.

It is an arithmetic number, because the mean of its divisors is an integer number (306234).

2⁸¹⁶⁶²² is an apocalyptic number.

816622 is a deficient number, since it is larger than the sum of its proper divisors (408314).

816622 is a wasteful number, since it uses less digits than its factorization.

816622 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408313.

The product of its digits is 1152, while the sum is 25.

The square root of 816622 is about 903.6714004548. The cubic root of 816622 is about 93.4703119067.

The spelling of 816622 in words is "eight hundred sixteen thousand, six hundred twenty-two".