1209041280 has 192 divisors, whose sum is σ = 4229409600. Its totient is φ = 318210048.

The previous prime is 1209041243. The next prime is 1209041293. The reversal of 1209041280 is 821409021.

It is a tau number, because it is divible by the number of its divisors (192).

It is a congruent number.

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, 453712 + ... + 456368.

It is an arithmetic number, because the mean of its divisors is an integer number (22028175).

Almost surely, 2^1209041280 is an apocalyptic number.

1209041280 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 1209041280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2114704800).

1209041280 is an abundant number, since it is smaller than the sum of its proper divisors (3020368320).

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

1209041280 is a wasteful number, since it uses less digits than its factorization.

1209041280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2761 (or 2746 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 1209041280 is about 34771.2708999829. The cubic root of 1209041280 is about 1065.3207259914.

The spelling of 1209041280 in words is "one billion, two hundred nine million, forty-one thousand, two hundred eighty".