1265166 has 32 divisors (see below), whose sum is σ = 3214080. Its totient is φ = 361368.

The previous prime is 1265129. The next prime is 1265167. The reversal of 1265166 is 6615621.

It is a happy number.

1265166 is a `hidden beast` number, since 1 + 2 + 651 + 6 + 6 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265167) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1296 + ... + 2051.

It is an arithmetic number, because the mean of its divisors is an integer number (100440).

2^1265166 is an apocalyptic number.

1265166 is an abundant number, since it is smaller than the sum of its proper divisors (1948914).

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

1265166 is a wasteful number, since it uses less digits than its factorization.

1265166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365 (or 3359 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 1265166 is about 1124.7959815006. The cubic root of 1265166 is about 108.1556397958.

It can be divided in two parts, 1265 and 166, that added together give a triangular number (1431 = T₅₃).

The spelling of 1265166 in words is "one million, two hundred sixty-five thousand, one hundred sixty-six".