1265880 has 128 divisors (see below), whose sum is σ = 4769280. Its totient is φ = 261120.

The previous prime is 1265867. The next prime is 1265899. The reversal of 1265880 is 885621.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Saint-Exupery number, since it is equal to the product of the sides of a Pythagorean triangle: 137 × 105 × 88.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 9172 + ... + 9308.

It is an arithmetic number, because the mean of its divisors is an integer number (37260).

2^1265880 is an apocalyptic number.

1265880 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 1265880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2384640).

1265880 is an abundant number, since it is smaller than the sum of its proper divisors (3503400).

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

1265880 is a wasteful number, since it uses less digits than its factorization.

1265880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169 (or 165 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1265880 is about 1125.1133276253. The cubic root of 1265880 is about 108.1759819497.

It can be divided in two parts, 1265 and 880, that added together give a triangular number (2145 = T₆₅).

The spelling of 1265880 in words is "one million, two hundred sixty-five thousand, eight hundred eighty".