387712889 has 4 divisors (see below), whose sum is σ = 394068900. Its totient is φ = 381356880.

The previous prime is 387712883. The next prime is 387712901. The reversal of 387712889 is 988217783.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 209757289 + 177955600 = 14483^2 + 13340^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387712889 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 387712889.

It is not an unprimeable number, because it can be changed into a prime (387712883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3177914 + ... + 3178035.

It is an arithmetic number, because the mean of its divisors is an integer number (98517225).

Almost surely, 2^387712889 is an apocalyptic number.

It is an amenable number.

387712889 is a deficient number, since it is larger than the sum of its proper divisors (6356011).

387712889 is an equidigital number, since it uses as much as digits as its factorization.

387712889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6356010.

The product of its digits is 1354752, while the sum is 53.

The square root of 387712889 is about 19690.4263285486. The cubic root of 387712889 is about 729.1833546084.

The spelling of 387712889 in words is "three hundred eighty-seven million, seven hundred twelve thousand, eight hundred eighty-nine".