1265688 has 24 divisors (see below), whose sum is σ = 3428100. Its totient is φ = 421872.

The previous prime is 1265681. The next prime is 1265729. The reversal of 1265688 is 8865621.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×1265688² = 3203932226688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265681) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8718 + ... + 8861.

2^1265688 is an apocalyptic number.

1265688 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1265688 is an abundant number, since it is smaller than the sum of its proper divisors (2162412).

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

1265688 is a wasteful number, since it uses less digits than its factorization.

1265688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17591 (or 17584 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 1265688 is about 1125.0279996516. The cubic root of 1265688 is about 108.1705125427.

It can be divided in two parts, 1265 and 688, that added together give a triangular number (1953 = T₆₂).

The spelling of 1265688 in words is "one million, two hundred sixty-five thousand, six hundred eighty-eight".