387666289 has 4 divisors (see below), whose sum is σ = 392022180. Its totient is φ = 383310400.

The previous prime is 387666277. The next prime is 387666299. The reversal of 387666289 is 982666783.

It is a happy number.

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 239630400 + 148035889 = 15480^2 + 12167^2 .

It is a cyclic number.

It is not a de Polignac number, because 387666289 - 2⁷ = 387666161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (387666299) 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, 2177812 + ... + 2177989.

It is an arithmetic number, because the mean of its divisors is an integer number (98005545).

Almost surely, 2^387666289 is an apocalyptic number.

It is an amenable number.

387666289 is a deficient number, since it is larger than the sum of its proper divisors (4355891).

387666289 is an equidigital number, since it uses as much as digits as its factorization.

387666289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4355890.

The product of its digits is 5225472, while the sum is 55.

The square root of 387666289 is about 19689.2429768135. The cubic root of 387666289 is about 729.1541394281.

The spelling of 387666289 in words is "three hundred eighty-seven million, six hundred sixty-six thousand, two hundred eighty-nine".