1265985 has 24 divisors (see below), whose sum is σ = 2508480. Its totient is φ = 578592.

The previous prime is 1265981. The next prime is 1265987. The reversal of 1265985 is 5895621.

It is a happy number.

It is not a de Polignac number, because 1265985 - 2² = 1265981 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1265981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1695 + ... + 2324.

It is an arithmetic number, because the mean of its divisors is an integer number (104520).

2^1265985 is an apocalyptic number.

1265985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265985 is a deficient number, since it is larger than the sum of its proper divisors (1242495).

1265985 is a wasteful number, since it uses less digits than its factorization.

1265985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037 (or 4034 counting only the distinct ones).

The product of its digits is 21600, while the sum is 36.

The square root of 1265985 is about 1125.1599886238. The cubic root of 1265985 is about 108.1789727977.

The spelling of 1265985 in words is "one million, two hundred sixty-five thousand, nine hundred eighty-five".