1265520 has 40 divisors (see below), whose sum is σ = 3923856. Its totient is φ = 337408.

The previous prime is 1265519. The next prime is 1265521. The reversal of 1265520 is 255621.

It is an interprime number because it is at equal distance from previous prime (1265519) and next prime (1265521).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2397 + ... + 2876.

2^1265520 is an apocalyptic number.

1265520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265520 is an abundant number, since it is smaller than the sum of its proper divisors (2658336).

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

1265520 is a wasteful number, since it uses less digits than its factorization.

1265520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5289 (or 5283 counting only the distinct ones).

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 1265520 is about 1124.9533323654. The cubic root of 1265520 is about 108.1657263579.

The spelling of 1265520 in words is "one million, two hundred sixty-five thousand, five hundred twenty".