1285582440 has 64 divisors (see below), whose sum is σ = 3866060160. Its totient is φ = 341994240.

The previous prime is 1285582433. The next prime is 1285582451. The reversal of 1285582440 is 442855821.

It is a happy number.

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

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, 37797 + ... + 63243.

It is an arithmetic number, because the mean of its divisors is an integer number (60407190).

Almost surely, 2^1285582440 is an apocalyptic number.

1285582440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1285582440 is an abundant number, since it is smaller than the sum of its proper divisors (2580477720).

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

1285582440 is a wasteful number, since it uses less digits than its factorization.

1285582440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25882 (or 25878 counting only the distinct ones).

The product of its (nonzero) digits is 102400, while the sum is 39.

The square root of 1285582440 is about 35855.0197322495. The cubic root of 1285582440 is about 1087.3432026547.

The spelling of 1285582440 in words is "one billion, two hundred eighty-five million, five hundred eighty-two thousand, four hundred forty".