1324640 has 48 divisors (see below), whose sum is σ = 3320352. Its totient is φ = 497664.

The previous prime is 1324627. The next prime is 1324649. The reversal of 1324640 is 464231.

It is a happy number.

It is a super-2 number, since 2×1324640² = 3509342259200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1324649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2477 + ... + 2963.

It is an arithmetic number, because the mean of its divisors is an integer number (69174).

2^1324640 is an apocalyptic number.

1324640 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 1324640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1660176).

1324640 is an abundant number, since it is smaller than the sum of its proper divisors (1995712).

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

1324640 is a wasteful number, since it uses less digits than its factorization.

1324640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 519 (or 511 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1324640 is about 1150.9300586917. The cubic root of 1324640 is about 109.8245135784.

Adding to 1324640 its reverse (464231), we get a palindrome (1788871).

The spelling of 1324640 in words is "one million, three hundred twenty-four thousand, six hundred forty".