1247969280 has 128 divisors (see below), whose sum is σ = 3995013600. Its totient is φ = 332660736.

The previous prime is 1247969257. The next prime is 1247969291. The reversal of 1247969280 is 829697421.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 490251 + ... + 492789.

Almost surely, 2^1247969280 is an apocalyptic number.

1247969280 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 1247969280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1997506800).

1247969280 is an abundant number, since it is smaller than the sum of its proper divisors (2747044320).

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

1247969280 is an frugal number, since it uses more digits than its factorization.

1247969280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2577 (or 2549 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 1247969280 is about 35326.6086682546. The cubic root of 1247969280 is about 1076.6336883550.

The spelling of 1247969280 in words is "one billion, two hundred forty-seven million, nine hundred sixty-nine thousand, two hundred eighty".