1285381532 has 24 divisors (see below), whose sum is σ = 2278864560. Its totient is φ = 634314240.

The previous prime is 1285381501. The next prime is 1285381549. The reversal of 1285381532 is 2351835821.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 142682 + ... + 151422.

It is an arithmetic number, because the mean of its divisors is an integer number (94952690).

Almost surely, 2^1285381532 is an apocalyptic number.

It is an amenable number.

1285381532 is a deficient number, since it is larger than the sum of its proper divisors (993483028).

1285381532 is a wasteful number, since it uses less digits than its factorization.

1285381532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9221 (or 9219 counting only the distinct ones).

The product of its digits is 57600, while the sum is 38.

The square root of 1285381532 is about 35852.2179509162. The cubic root of 1285381532 is about 1087.2865571680.

The spelling of 1285381532 in words is "one billion, two hundred eighty-five million, three hundred eighty-one thousand, five hundred thirty-two".