1265144000 has 56 divisors (see below), whose sum is σ = 3133148928. Its totient is φ = 506054400.

The previous prime is 1265143981. The next prime is 1265144009. The reversal of 1265144000 is 4415621.

It is not an unprimeable number, because it can be changed into a prime (1265144009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 71072 + ... + 87071.

It is an arithmetic number, because the mean of its divisors is an integer number (55949088).

Almost surely, 2^1265144000 is an apocalyptic number.

1265144000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265144000 is an abundant number, since it is smaller than the sum of its proper divisors (1868004928).

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

1265144000 is an equidigital number, since it uses as much as digits as its factorization.

1265144000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158170 (or 158150 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 1265144000 is about 35568.8627875562. The cubic root of 1265144000 is about 1081.5501288526.

Adding to 1265144000 its reverse (4415621), we get a palindrome (1269559621).

The spelling of 1265144000 in words is "one billion, two hundred sixty-five million, one hundred forty-four thousand".