1265440 has 48 divisors (see below), whose sum is σ = 3265920. Its totient is φ = 459520.

The previous prime is 1265431. The next prime is 1265443. The reversal of 1265440 is 445621.

1265440 = T₁₆₆ + T₁₆₇ + ... + T₂₂₉.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (1265443) 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, 1401 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (68040).

2^1265440 is an apocalyptic number.

1265440 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 1265440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1632960).

1265440 is an abundant number, since it is smaller than the sum of its proper divisors (2000480).

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

1265440 is a wasteful number, since it uses less digits than its factorization.

1265440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745 (or 737 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 1265440 is about 1124.9177747729. The cubic root of 1265440 is about 108.1634470734.

The spelling of 1265440 in words is "one million, two hundred sixty-five thousand, four hundred forty".