1424640 has 144 divisors (see below), whose sum is σ = 5298048. Its totient is φ = 319488.

The previous prime is 1424603. The next prime is 1424659. The reversal of 1424640 is 464241.

1424640 is nontrivially palindromic in base 11.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26854 + ... + 26906.

It is an arithmetic number, because the mean of its divisors is an integer number (36792).

2^1424640 is an apocalyptic number.

1424640 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 1424640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2649024).

1424640 is an abundant number, since it is smaller than the sum of its proper divisors (3873408).

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

1424640 is an equidigital number, since it uses as much as digits as its factorization.

1424640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84 (or 70 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1424640 is about 1193.5828416997. The cubic root of 1424640 is about 112.5213786532.

Adding to 1424640 its reverse (464241), we get a palindrome (1888881).

The spelling of 1424640 in words is "one million, four hundred twenty-four thousand, six hundred forty".