1265905 has 16 divisors (see below), whose sum is σ = 1644624. Its totient is φ = 931840.

The previous prime is 1265903. The next prime is 1265909. The reversal of 1265905 is 5095621.

It can be written as a sum of positive squares in 8 ways, for example, as 97344 + 1168561 = 312^2 + 1081^2 .

It is not a de Polignac number, because 1265905 - 2¹ = 1265903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265903) 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, 4365 + ... + 4645.

It is an arithmetic number, because the mean of its divisors is an integer number (102789).

2^1265905 is an apocalyptic number.

It is an amenable number.

1265905 is a deficient number, since it is larger than the sum of its proper divisors (378719).

1265905 is a wasteful number, since it uses less digits than its factorization.

1265905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356.

The product of its (nonzero) digits is 2700, while the sum is 28.

The square root of 1265905 is about 1125.1244375624. The cubic root of 1265905 is about 108.1766940714.

The spelling of 1265905 in words is "one million, two hundred sixty-five thousand, nine hundred five".