1275440 has 40 divisors (see below), whose sum is σ = 3013200. Its totient is φ = 502016.

The previous prime is 1275437. The next prime is 1275457. The reversal of 1275440 is 445721.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8486 + ... + 8634.

It is an arithmetic number, because the mean of its divisors is an integer number (75330).

2^1275440 is an apocalyptic number.

1275440 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 1275440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1506600).

1275440 is an abundant number, since it is smaller than the sum of its proper divisors (1737760).

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

1275440 is a wasteful number, since it uses less digits than its factorization.

1275440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 1275440 is about 1129.3537975320. The cubic root of 1275440 is about 108.4476164131.

The spelling of 1275440 in words is "one million, two hundred seventy-five thousand, four hundred forty".