388807669 has 8 divisors (see below), whose sum is σ = 402579000. Its totient is φ = 375060672.

The previous prime is 388807631. The next prime is 388807711. The reversal of 388807669 is 966708883.

It can be written as a sum of positive squares in 4 ways, for example, as 124322500 + 264485169 = 11150^2 + 16263^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 388807669 - 2⁷ = 388807541 is a prime.

It is a super-2 number, since 2×388807669² = 302342806946427122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388802669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30187 + ... + 41095.

It is an arithmetic number, because the mean of its divisors is an integer number (50322375).

Almost surely, 2^388807669 is an apocalyptic number.

It is an amenable number.

388807669 is a deficient number, since it is larger than the sum of its proper divisors (13771331).

388807669 is a wasteful number, since it uses less digits than its factorization.

388807669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12167.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 388807669 is about 19718.2065360925. The cubic root of 388807669 is about 729.8690382446.

The spelling of 388807669 in words is "three hundred eighty-eight million, eight hundred seven thousand, six hundred sixty-nine".