1643741 has 16 divisors (see below), whose sum is σ = 1918080. Its totient is φ = 1393920.

The previous prime is 1643729. The next prime is 1643743. The reversal of 1643741 is 1473461.

It is not a de Polignac number, because 1643741 - 2¹⁰ = 1642717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1643741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1643743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18425 + ... + 18513.

It is an arithmetic number, because the mean of its divisors is an integer number (119880).

2^1643741 is an apocalyptic number.

1643741 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1643741 is a deficient number, since it is larger than the sum of its proper divisors (274339).

1643741 is a wasteful number, since it uses less digits than its factorization.

1643741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196.

The product of its digits is 2016, while the sum is 26.

The square root of 1643741 is about 1282.0846305919. The cubic root of 1643741 is about 118.0169706512.

The spelling of 1643741 in words is "one million, six hundred forty-three thousand, seven hundred forty-one".