1285643140 has 48 divisors (see below), whose sum is σ = 2739018240. Its totient is φ = 506844800.

The previous prime is 1285643131. The next prime is 1285643153. The reversal of 1285643140 is 413465821.

It is a junction number, because it is equal to n+sod(n) for n = 1285643096 and 1285643105.

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 15 ways as a sum of consecutive naturals, for example, 481449 + ... + 484111.

It is an arithmetic number, because the mean of its divisors is an integer number (57062880).

Almost surely, 2^1285643140 is an apocalyptic number.

1285643140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285643140 is an abundant number, since it is smaller than the sum of its proper divisors (1453375100).

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

1285643140 is a wasteful number, since it uses less digits than its factorization.

1285643140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012 (or 3010 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 1285643140 is about 35855.8661867204. The cubic root of 1285643140 is about 1087.3603157006.

The spelling of 1285643140 in words is "one billion, two hundred eighty-five million, six hundred forty-three thousand, one hundred forty".