1280949120 has 512 divisors, whose sum is σ = 5181926400. Its totient is φ = 296017920.

The previous prime is 1280949107. The next prime is 1280949149. The reversal of 1280949120 is 219490821.

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 63 ways as a sum of consecutive naturals, for example, 4371694 + ... + 4371986.

It is an arithmetic number, because the mean of its divisors is an integer number (10120950).

Almost surely, 2^1280949120 is an apocalyptic number.

1280949120 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 1280949120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2590963200).

1280949120 is an abundant number, since it is smaller than the sum of its proper divisors (3900977280).

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

1280949120 is a wasteful number, since it uses less digits than its factorization.

1280949120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355 (or 337 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 1280949120 is about 35790.3495372705. The cubic root of 1280949120 is about 1086.0353457560.

The spelling of 1280949120 in words is "one billion, two hundred eighty million, nine hundred forty-nine thousand, one hundred twenty".