1280907940 has 24 divisors (see below), whose sum is σ = 2896823160. Its totient is φ = 472950528.

The previous prime is 1280907917. The next prime is 1280907977. The reversal of 1280907940 is 497090821.

It can be written as a sum of positive squares in 4 ways, for example, as 31002624 + 1249905316 = 5568^2 + 35354^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1280907893 and 1280907902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2463025 + ... + 2463544.

It is an arithmetic number, because the mean of its divisors is an integer number (120700965).

Almost surely, 2^1280907940 is an apocalyptic number.

1280907940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280907940 is an abundant number, since it is smaller than the sum of its proper divisors (1615915220).

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

1280907940 is a wasteful number, since it uses less digits than its factorization.

1280907940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4926591 (or 4926589 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1280907940 is about 35789.7742379021. The cubic root of 1280907940 is about 1086.0237076630.

The spelling of 1280907940 in words is "one billion, two hundred eighty million, nine hundred seven thousand, nine hundred forty".