388887869 has 8 divisors (see below), whose sum is σ = 412099128. Its totient is φ = 365713920.

The previous prime is 388887857. The next prime is 388887881. The reversal of 388887869 is 968788883.

It is an interprime number because it is at equal distance from previous prime (388887857) and next prime (388887881).

It can be written as a sum of positive squares in 4 ways, for example, as 271425625 + 117462244 = 16475^2 + 10838^2 .

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 388887869 - 2⁴ = 388887853 is a prime.

It is a super-2 number, since 2×388887869² = 302467549310722322, 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 (388887469) 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, 13799 + ... + 31115.

It is an arithmetic number, because the mean of its divisors is an integer number (51512391).

Almost surely, 2^388887869 is an apocalyptic number.

It is an amenable number.

388887869 is a deficient number, since it is larger than the sum of its proper divisors (23211259).

388887869 is a wasteful number, since it uses less digits than its factorization.

388887869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18655.

The product of its digits is 37158912, while the sum is 65.

The square root of 388887869 is about 19720.2400847454. The cubic root of 388887869 is about 729.9192185584.

The spelling of 388887869 in words is "three hundred eighty-eight million, eight hundred eighty-seven thousand, eight hundred sixty-nine".