1285557387 has 8 divisors (see below), whose sum is σ = 1723547280. Its totient is φ = 852302880.

The previous prime is 1285557359. The next prime is 1285557389. The reversal of 1285557387 is 7837555821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1285557387 - 2¹¹ = 1285555339 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1285557389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1183212 + ... + 1184297.

It is an arithmetic number, because the mean of its divisors is an integer number (215443410).

Almost surely, 2^1285557387 is an apocalyptic number.

1285557387 is a deficient number, since it is larger than the sum of its proper divisors (437989893).

1285557387 is a wasteful number, since it uses less digits than its factorization.

1285557387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2367693.

The product of its digits is 2352000, while the sum is 51.

The square root of 1285557387 is about 35854.6703652397. The cubic root of 1285557387 is about 1087.3361393488.

The spelling of 1285557387 in words is "one billion, two hundred eighty-five million, five hundred fifty-seven thousand, three hundred eighty-seven".