1265538260 has 24 divisors (see below), whose sum is σ = 3037292160. Its totient is φ = 433898784.

The previous prime is 1265538257. The next prime is 1265538283. The reversal of 1265538260 is 628355621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4519640 + ... + 4519919.

It is an arithmetic number, because the mean of its divisors is an integer number (126553840).

Almost surely, 2^1265538260 is an apocalyptic number.

1265538260 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265538260 is an abundant number, since it is smaller than the sum of its proper divisors (1771753900).

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

1265538260 is a wasteful number, since it uses less digits than its factorization.

1265538260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9039575 (or 9039573 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 38.

The square root of 1265538260 is about 35574.4045628314. The cubic root of 1265538260 is about 1081.6624659111.

The spelling of 1265538260 in words is "one billion, two hundred sixty-five million, five hundred thirty-eight thousand, two hundred sixty".