387887789 has 4 divisors (see below), whose sum is σ = 401263260. Its totient is φ = 374512320.

The previous prime is 387887783. The next prime is 387887791. The reversal of 387887789 is 987788783.

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 247275625 + 140612164 = 15725^2 + 11858^2 .

It is a cyclic number.

It is not a de Polignac number, because 387887789 - 2²⁰ = 386839213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387887783) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 6687692 + ... + 6687749.

It is an arithmetic number, because the mean of its divisors is an integer number (100315815).

Almost surely, 2^387887789 is an apocalyptic number.

It is an amenable number.

387887789 is a deficient number, since it is larger than the sum of its proper divisors (13375471).

387887789 is a wasteful number, since it uses less digits than its factorization.

387887789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13375470.

The product of its digits is 37933056, while the sum is 65.

The square root of 387887789 is about 19694.8670724125. The cubic root of 387887789 is about 729.2929846980.

The spelling of 387887789 in words is "three hundred eighty-seven million, eight hundred eighty-seven thousand, seven hundred eighty-nine".