1285905900 has 72 divisors (see below), whose sum is σ = 3799756800. Its totient is φ = 335608640.

The previous prime is 1285905899. The next prime is 1285905911. The reversal of 1285905900 is 95095821.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31500 + ... + 59699.

It is an arithmetic number, because the mean of its divisors is an integer number (52774400).

Almost surely, 2^1285905900 is an apocalyptic number.

1285905900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285905900 is an abundant number, since it is smaller than the sum of its proper divisors (2513850900).

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

1285905900 is a wasteful number, since it uses less digits than its factorization.

1285905900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91263 (or 91256 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 1285905900 is about 35859.5301140436. The cubic root of 1285905900 is about 1087.4343889601.

The spelling of 1285905900 in words is "one billion, two hundred eighty-five million, nine hundred five thousand, nine hundred".