1265979 has 24 divisors (see below), whose sum is σ = 2002752. Its totient is φ = 705120.

The previous prime is 1265977. The next prime is 1265981. The reversal of 1265979 is 9795621.

1265979 = T₅₅ + T₅₆ + ... + T₁₉₇.

It is an interprime number because it is at equal distance from previous prime (1265977) and next prime (1265981).

It is not a de Polignac number, because 1265979 - 2¹ = 1265977 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (1265977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5464 + ... + 5690.

It is an arithmetic number, because the mean of its divisors is an integer number (83448).

2^1265979 is an apocalyptic number.

1265979 is a deficient number, since it is larger than the sum of its proper divisors (736773).

1265979 is a wasteful number, since it uses less digits than its factorization.

1265979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267 (or 254 counting only the distinct ones).

The product of its digits is 34020, while the sum is 39.

The square root of 1265979 is about 1125.1573223332. The cubic root of 1265979 is about 108.1788018966.

It can be divided in two parts, 126 and 5979, that added together give a triangular number (6105 = T₁₁₀).

The spelling of 1265979 in words is "one million, two hundred sixty-five thousand, nine hundred seventy-nine".