1643796 has 72 divisors (see below), whose sum is σ = 5189184. Its totient is φ = 426240.

The previous prime is 1643791. The next prime is 1643797. The reversal of 1643796 is 6973461.

1643796 is a `hidden beast` number, since 1 + 643 + 7 + 9 + 6 = 666.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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

It is a d-powerful number, because it can be written as 1 + 6⁵ + 4⁷ + 3¹³ + 7⁵ + 9³ + 6⁵ .

It is a self number, because there is not a number n which added to its sum of digits gives 1643796.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2476 + ... + 3068.

It is an arithmetic number, because the mean of its divisors is an integer number (72072).

2^1643796 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 1643796, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2594592).

1643796 is an abundant number, since it is smaller than the sum of its proper divisors (3545388).

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

1643796 is a wasteful number, since it uses less digits than its factorization.

1643796 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 616 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 1643796 is about 1282.1060798545. The cubic root of 1643796 is about 118.0182869293.

The spelling of 1643796 in words is "one million, six hundred forty-three thousand, seven hundred ninety-six".