1280403616 has 24 divisors (see below), whose sum is σ = 2653469280. Its totient is φ = 606506688.

The previous prime is 1280403601. The next prime is 1280403617. The reversal of 1280403616 is 6163040821.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (1280403617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052356 + ... + 1053571.

It is an arithmetic number, because the mean of its divisors is an integer number (110561220).

Almost surely, 2^1280403616 is an apocalyptic number.

1280403616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1280403616 is an abundant number, since it is smaller than the sum of its proper divisors (1373065664).

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

1280403616 is a wasteful number, since it uses less digits than its factorization.

1280403616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105956 (or 2105948 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1280403616 is about 35782.7279004829. The cubic root of 1280403616 is about 1085.8811578094.

The spelling of 1280403616 in words is "one billion, two hundred eighty million, four hundred three thousand, six hundred sixteen".