388729 has 4 divisors (see below), whose sum is σ = 424080. Its totient is φ = 353380.

The previous prime is 388727. The next prime is 388757. The reversal of 388729 is 927883.

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 388729 - 2¹ = 388727 is a prime.

It is a super-2 number, since 2×388729² = 302220470882, which contains 22 as substring.

It is a Duffinian number.

It is a nialpdrome in base 9.

It is not an unprimeable number, because it can be changed into a prime (388727) 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, 17659 + ... + 17680.

It is an arithmetic number, because the mean of its divisors is an integer number (106020).

2³⁸⁸⁷²⁹ is an apocalyptic number.

It is an amenable number.

388729 is a deficient number, since it is larger than the sum of its proper divisors (35351).

388729 is a wasteful number, since it uses less digits than its factorization.

388729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35350.

The product of its digits is 24192, while the sum is 37.

The square root of 388729 is about 623.4813549738. The cubic root of 388729 is about 72.9819809157.

It can be divided in two parts, 3887 and 29, that added together give a triangular number (3916 = T₈₈).

The spelling of 388729 in words is "three hundred eighty-eight thousand, seven hundred twenty-nine".