1253440 has 28 divisors (see below), whose sum is σ = 2985516. Its totient is φ = 501248.

The previous prime is 1253437. The next prime is 1253453. The reversal of 1253440 is 443521.

It can be written as a sum of positive squares in 2 ways, for example, as 746496 + 506944 = 864^2 + 712^2 .

It is a super-2 number, since 2×1253440² = 3142223667200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1639 + ... + 2278.

2^1253440 is an apocalyptic number.

1253440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1253440 is an abundant number, since it is smaller than the sum of its proper divisors (1732076).

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

1253440 is an equidigital number, since it uses as much as digits as its factorization.

1253440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3934 (or 3924 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 1253440 is about 1119.5713465430. The cubic root of 1253440 is about 107.8204607298.

Adding to 1253440 its reverse (443521), we get a palindrome (1696961).

The spelling of 1253440 in words is "one million, two hundred fifty-three thousand, four hundred forty".