1229165280 has 480 divisors, whose sum is σ = 5255845056. Its totient is φ = 264093696.

The previous prime is 1229165269. The next prime is 1229165293. The reversal of 1229165280 is 825619221.

1229165280 is a `hidden beast` number, since 122 + 9 + 1 + 6 + 528 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1541842 + ... + 1542638.

Almost surely, 2^1229165280 is an apocalyptic number.

1229165280 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 1229165280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2627922528).

1229165280 is an abundant number, since it is smaller than the sum of its proper divisors (4026679776).

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

1229165280 is a wasteful number, since it uses less digits than its factorization.

1229165280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848 (or 831 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 1229165280 is about 35059.4535040123. The cubic root of 1229165280 is about 1071.1988426323.

The spelling of 1229165280 in words is "one billion, two hundred twenty-nine million, one hundred sixty-five thousand, two hundred eighty".