1252440 has 144 divisors (see below), whose sum is σ = 4801680. Its totient is φ = 282240.

The previous prime is 1252439. The next prime is 1252451. The reversal of 1252440 is 442521.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 17605 + ... + 17675.

It is an arithmetic number, because the mean of its divisors is an integer number (33345).

2^1252440 is an apocalyptic number.

1252440 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 1252440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2400840).

1252440 is an abundant number, since it is smaller than the sum of its proper divisors (3549240).

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

1252440 is a wasteful number, since it uses less digits than its factorization.

1252440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102 (or 88 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 1252440 is about 1119.1246579358. The cubic root of 1252440 is about 107.7917798871.

Adding to 1252440 its reverse (442521), we get a palindrome (1694961).

The spelling of 1252440 in words is "one million, two hundred fifty-two thousand, four hundred forty".