1265865 has 8 divisors (see below), whose sum is σ = 2025408. Its totient is φ = 675120.

The previous prime is 1265863. The next prime is 1265867. The reversal of 1265865 is 5685621.

1265865 = T₃₆₆ + T₃₆₇ + ... + T₃₈₃.

It is an interprime number because it is at equal distance from previous prime (1265863) and next prime (1265867).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1265865 - 2¹ = 1265863 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

1265865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (1265861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42181 + ... + 42210.

It is an arithmetic number, because the mean of its divisors is an integer number (253176).

2^1265865 is an apocalyptic number.

1265865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1265865 is a deficient number, since it is larger than the sum of its proper divisors (759543).

1265865 is an equidigital number, since it uses as much as digits as its factorization.

1265865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84399.

The product of its digits is 14400, while the sum is 33.

The square root of 1265865 is about 1125.1066616104. The cubic root of 1265865 is about 108.1755546722.

The spelling of 1265865 in words is "one million, two hundred sixty-five thousand, eight hundred sixty-five".