1265284820 has 24 divisors (see below), whose sum is σ = 2661017184. Its totient is φ = 505367456.

The previous prime is 1265284817. The next prime is 1265284919. The reversal of 1265284820 is 284825621.

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, 32654 + ... + 59973.

It is an arithmetic number, because the mean of its divisors is an integer number (110875716).

Almost surely, 2^1265284820 is an apocalyptic number.

1265284820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265284820 is an abundant number, since it is smaller than the sum of its proper divisors (1395732364).

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

1265284820 is a wasteful number, since it uses less digits than its factorization.

1265284820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93319 (or 93317 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 38.

The square root of 1265284820 is about 35570.8422728504. The cubic root of 1265284820 is about 1081.5902555730.

The spelling of 1265284820 in words is "one billion, two hundred sixty-five million, two hundred eighty-four thousand, eight hundred twenty".