388689929 has 4 divisors (see below), whose sum is σ = 402093060. Its totient is φ = 375286800.

The previous prime is 388689919. The next prime is 388689941. The reversal of 388689929 is 929986883.

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 140469904 + 248220025 = 11852^2 + 15755^2 .

It is a cyclic number.

It is not a de Polignac number, because 388689929 - 2¹² = 388685833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388689919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6701522 + ... + 6701579.

It is an arithmetic number, because the mean of its divisors is an integer number (100523265).

Almost surely, 2^388689929 is an apocalyptic number.

It is an amenable number.

388689929 is a deficient number, since it is larger than the sum of its proper divisors (13403131).

388689929 is a wasteful number, since it uses less digits than its factorization.

388689929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13403130.

The product of its digits is 13436928, while the sum is 62.

The square root of 388689929 is about 19715.2207443893. The cubic root of 388689929 is about 729.7953570364.

The spelling of 388689929 in words is "three hundred eighty-eight million, six hundred eighty-nine thousand, nine hundred twenty-nine".