1265449248 has 144 divisors (see below), whose sum is σ = 4329299520. Its totient is φ = 342517248.

The previous prime is 1265449223. The next prime is 1265449261. The reversal of 1265449248 is 8429445621.

It is a happy number.

1265449248 is a `hidden beast` number, since 12 + 6 + 544 + 92 + 4 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21786 + ... + 54822.

It is an arithmetic number, because the mean of its divisors is an integer number (30064580).

Almost surely, 2^1265449248 is an apocalyptic number.

1265449248 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1265449248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2164649760).

1265449248 is an abundant number, since it is smaller than the sum of its proper divisors (3063850272).

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

1265449248 is a wasteful number, since it uses less digits than its factorization.

1265449248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33079 (or 33068 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The square root of 1265449248 is about 35573.1534728087. The cubic root of 1265449248 is about 1081.6371056356.

The spelling of 1265449248 in words is "one billion, two hundred sixty-five million, four hundred forty-nine thousand, two hundred forty-eight".