1265355 has 64 divisors (see below), whose sum is σ = 2795520. Its totient is φ = 528768.

The previous prime is 1265353. The next prime is 1265377. The reversal of 1265355 is 5535621.

1265355 is a `hidden beast` number, since 1 + 2 + 653 + 5 + 5 = 666.

It is not a de Polignac number, because 1265355 - 2¹ = 1265353 is a prime.

It is a super-2 number, since 2×1265355² = 3202246552050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1265353) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12234 + ... + 12336.

It is an arithmetic number, because the mean of its divisors is an integer number (43680).

2^1265355 is an apocalyptic number.

1265355 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1265355 is an abundant number, since it is smaller than the sum of its proper divisors (1530165).

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

1265355 is a wasteful number, since it uses less digits than its factorization.

1265355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 131 counting only the distinct ones).

The product of its digits is 4500, while the sum is 27.

The square root of 1265355 is about 1124.8799935993. The cubic root of 1265355 is about 108.1610252283.

It can be divided in two parts, 1 and 265355, that added together give a triangular number (265356 = T₇₂₈).

The spelling of 1265355 in words is "one million, two hundred sixty-five thousand, three hundred fifty-five".