1641816 has 64 divisors (see below), whose sum is σ = 4982400. Its totient is φ = 496800.

The previous prime is 1641811. The next prime is 1641817. The reversal of 1641816 is 6181461.

1641816 is a `hidden beast` number, since 1 + 641 + 8 + 16 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 1641816.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1641811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2031 + ... + 2721.

It is an arithmetic number, because the mean of its divisors is an integer number (77850).

2^1641816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1641816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2491200).

1641816 is an abundant number, since it is smaller than the sum of its proper divisors (3340584).

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

1641816 is a wasteful number, since it uses less digits than its factorization.

1641816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717 (or 707 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The square root of 1641816 is about 1281.3336801942. Note that the first 3 decimals coincide. The cubic root of 1641816 is about 117.9708824067.

The spelling of 1641816 in words is "one million, six hundred forty-one thousand, eight hundred sixteen".