1985638135 has 8 divisors (see below), whose sum is σ = 2566055520. Its totient is φ = 1466317344.

The previous prime is 1985638117. The next prime is 1985638169. The reversal of 1985638135 is 5318365891.

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

It is a cyclic number.

It is not a de Polignac number, because 1985638135 - 2¹⁷ = 1985507063 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15274075 + ... + 15274204.

It is an arithmetic number, because the mean of its divisors is an integer number (320756940).

Almost surely, 2^1985638135 is an apocalyptic number.

1985638135 is a deficient number, since it is larger than the sum of its proper divisors (580417385).

1985638135 is a wasteful number, since it uses less digits than its factorization.

1985638135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30548297.

The product of its digits is 777600, while the sum is 49.

The square root of 1985638135 is about 44560.4997166773. The cubic root of 1985638135 is about 1256.8979995277.

The spelling of 1985638135 in words is "one billion, nine hundred eighty-five million, six hundred thirty-eight thousand, one hundred thirty-five".