841640 has 32 divisors (see below), whose sum is σ = 1934280. Its totient is φ = 329472.

The previous prime is 841637. The next prime is 841651. The reversal of 841640 is 46148.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 784996 + 56644 = 886^2 + 238^2 .

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1922 + ... + 2318.

2⁸⁴¹⁶⁴⁰ is an apocalyptic number.

841640 is the 530-th octagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 841640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (967140).

841640 is an abundant number, since it is smaller than the sum of its proper divisors (1092640).

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

841640 is a wasteful number, since it uses less digits than its factorization.

841640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 457 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 841640 is about 917.4093960714. The cubic root of 841640 is about 94.4152445935.

Adding to 841640 its reverse (46148), we get a palindrome (887788).

The spelling of 841640 in words is "eight hundred forty-one thousand, six hundred forty".