1841640 has 64 divisors (see below), whose sum is σ = 5616000. Its totient is φ = 483072.

The previous prime is 1841639. The next prime is 1841641. The reversal of 1841640 is 461481.

It is an interprime number because it is at equal distance from previous prime (1841639) and next prime (1841641).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 1841640.

It is not an unprimeable number, because it can be changed into a prime (1841641) 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, 12286 + ... + 12434.

It is an arithmetic number, because the mean of its divisors is an integer number (87750).

2^1841640 is an apocalyptic number.

1841640 is a gapful number since it is divisible by the number (10) 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 1841640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2808000).

1841640 is an abundant number, since it is smaller than the sum of its proper divisors (3774360).

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

1841640 is a wasteful number, since it uses less digits than its factorization.

1841640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 1841640 is about 1357.0703740042. The cubic root of 1841640 is about 122.5749090635.

The spelling of 1841640 in words is "one million, eight hundred forty-one thousand, six hundred forty".