1265978044 has 12 divisors (see below), whose sum is σ = 2215893064. Its totient is φ = 632865744.

The previous prime is 1265978023. The next prime is 1265978071. The reversal of 1265978044 is 4408795621.

It is a junction number, because it is equal to n+sod(n) for n = 1265977985 and 1265978003.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5382 + ... + 50605.

Almost surely, 2^1265978044 is an apocalyptic number.

It is an amenable number.

1265978044 is a deficient number, since it is larger than the sum of its proper divisors (949915020).

1265978044 is a wasteful number, since it uses less digits than its factorization.

1265978044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61644 (or 61642 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 46.

The square root of 1265978044 is about 35580.5852116010. The cubic root of 1265978044 is about 1081.7877466629.

The spelling of 1265978044 in words is "one billion, two hundred sixty-five million, nine hundred seventy-eight thousand, forty-four".