1622816 has 48 divisors (see below), whose sum is σ = 3556224. Its totient is φ = 724224.

The previous prime is 1622813. The next prime is 1622827. The reversal of 1622816 is 6182261.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (1622813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19511 + ... + 19593.

It is an arithmetic number, because the mean of its divisors is an integer number (74088).

2^1622816 is an apocalyptic number.

1622816 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1622816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1778112).

1622816 is an abundant number, since it is smaller than the sum of its proper divisors (1933408).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1622816 is a wasteful number, since it uses less digits than its factorization.

1622816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 153 (or 145 counting only the distinct ones).

The product of its digits is 1152, while the sum is 26.

The square root of 1622816 is about 1273.8979550969. The cubic root of 1622816 is about 117.5140408753.

The spelling of 1622816 in words is "one million, six hundred twenty-two thousand, eight hundred sixteen".