1245805280 has 96 divisors (see below), whose sum is σ = 3028977504. Its totient is φ = 483997696.

The previous prime is 1245805261. The next prime is 1245805321. The reversal of 1245805280 is 825085421.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1245805280.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 906674 + ... + 908046.

It is an arithmetic number, because the mean of its divisors is an integer number (31551849).

Almost surely, 2^1245805280 is an apocalyptic number.

1245805280 is a gapful number since it is divisible by the number (10) 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 1245805280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1514488752).

1245805280 is an abundant number, since it is smaller than the sum of its proper divisors (1783172224).

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

1245805280 is a wasteful number, since it uses less digits than its factorization.

1245805280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1548 (or 1540 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 35.

The square root of 1245805280 is about 35295.9669084160. The cubic root of 1245805280 is about 1076.0110279269.

The spelling of 1245805280 in words is "one billion, two hundred forty-five million, eight hundred five thousand, two hundred eighty".