385978987 has 4 divisors (see below), whose sum is σ = 388569600. Its totient is φ = 383388376.

The previous prime is 385978981. The next prime is 385979021. The reversal of 385978987 is 789879583.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789879583 = 29 ⋅27237227.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-385978987 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (385978981) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1295083 + ... + 1295380.

It is an arithmetic number, because the mean of its divisors is an integer number (97142400).

Almost surely, 2^385978987 is an apocalyptic number.

385978987 is a deficient number, since it is larger than the sum of its proper divisors (2590613).

385978987 is a wasteful number, since it uses less digits than its factorization.

385978987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2590612.

The product of its digits is 30481920, while the sum is 64.

The square root of 385978987 is about 19646.3479303406. The cubic root of 385978987 is about 728.0947295268.

The spelling of 385978987 in words is "three hundred eighty-five million, nine hundred seventy-eight thousand, nine hundred eighty-seven".