1265005180 has 24 divisors (see below), whose sum is σ = 2796328080. Its totient is φ = 479370240.

The previous prime is 1265005171. The next prime is 1265005243. The reversal of 1265005180 is 815005621.

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 7 ways as a sum of consecutive naturals, for example, 1664101 + ... + 1664860.

It is an arithmetic number, because the mean of its divisors is an integer number (116513670).

Almost surely, 2^1265005180 is an apocalyptic number.

1265005180 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265005180 is an abundant number, since it is smaller than the sum of its proper divisors (1531322900).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1265005180 is a wasteful number, since it uses less digits than its factorization.

1265005180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3328989 (or 3328987 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 1265005180 is about 35566.9113081246. The cubic root of 1265005180 is about 1081.5105691185.

The spelling of 1265005180 in words is "one billion, two hundred sixty-five million, five thousand, one hundred eighty".