387665669 has 4 divisors (see below), whose sum is σ = 387794496. Its totient is φ = 387536844.

The previous prime is 387665647. The next prime is 387665689. The reversal of 387665669 is 966566783.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 387665669 - 2⁸ = 387665413 is a prime.

It is a super-2 number, since 2×387665669² = 300569341842435122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387665689) 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, 59789 + ... + 65954.

It is an arithmetic number, because the mean of its divisors is an integer number (96948624).

Almost surely, 2^387665669 is an apocalyptic number.

It is an amenable number.

387665669 is a deficient number, since it is larger than the sum of its proper divisors (128827).

387665669 is a wasteful number, since it uses less digits than its factorization.

387665669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128826.

The product of its digits is 9797760, while the sum is 56.

The square root of 387665669 is about 19689.2272321694. The cubic root of 387665669 is about 729.1537507125.

The spelling of 387665669 in words is "three hundred eighty-seven million, six hundred sixty-five thousand, six hundred sixty-nine".