1280397120 has 224 divisors, whose sum is σ = 4290803712. Its totient is φ = 322848768.

The previous prime is 1280397119. The next prime is 1280397121. The reversal of 1280397120 is 217930821.

It is an interprime number because it is at equal distance from previous prime (1280397119) and next prime (1280397121).

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280397121) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2273959 + ... + 2274521.

Almost surely, 2^1280397120 is an apocalyptic number.

1280397120 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 1280397120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2145401856).

1280397120 is an abundant number, since it is smaller than the sum of its proper divisors (3010406592).

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

1280397120 is a wasteful number, since it uses less digits than its factorization.

1280397120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 709 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 1280397120 is about 35782.6371303178. The cubic root of 1280397120 is about 1085.8793214364.

The spelling of 1280397120 in words is "one billion, two hundred eighty million, three hundred ninety-seven thousand, one hundred twenty".