1280338520 has 32 divisors (see below), whose sum is σ = 2881904400. Its totient is φ = 511932288.

The previous prime is 1280338489. The next prime is 1280338537. The reversal of 1280338520 is 258330821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134147 + ... + 143373.

Almost surely, 2^1280338520 is an apocalyptic number.

1280338520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280338520 is an abundant number, since it is smaller than the sum of its proper divisors (1601565880).

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

1280338520 is a wasteful number, since it uses less digits than its factorization.

1280338520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12707 (or 12703 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1280338520 is about 35781.8182880636. The cubic root of 1280338520 is about 1085.8627553523.

The spelling of 1280338520 in words is "one billion, two hundred eighty million, three hundred thirty-eight thousand, five hundred twenty".