1265220408 has 32 divisors (see below), whose sum is σ = 3180537360. Its totient is φ = 419408640.

The previous prime is 1265220403. The next prime is 1265220419. The reversal of 1265220408 is 8040225621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265220403) by changing a digit.

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, 141285 + ... + 149972.

Almost surely, 2^1265220408 is an apocalyptic number.

It is an amenable number.

1265220408 is an abundant number, since it is smaller than the sum of its proper divisors (1915316952).

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

1265220408 is a wasteful number, since it uses less digits than its factorization.

1265220408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291447 (or 291443 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 1265220408 is about 35569.9368568458. The cubic root of 1265220408 is about 1081.5719017150.

The spelling of 1265220408 in words is "one billion, two hundred sixty-five million, two hundred twenty thousand, four hundred eight".