388779 has 4 divisors (see below), whose sum is σ = 518376. Its totient is φ = 259184.

The previous prime is 388777. The next prime is 388781. The reversal of 388779 is 977883.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (388777) and next prime (388781).

It is a cyclic number.

It is not a de Polignac number, because 388779 - 2¹ = 388777 is a prime.

It is a super-2 number, since 2×388779² = 302298221682, which contains 22 as substring.

It is a D-number.

388779 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 388779.

It is not an unprimeable number, because it can be changed into a prime (388777) 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, 64794 + ... + 64799.

It is an arithmetic number, because the mean of its divisors is an integer number (129594).

2³⁸⁸⁷⁷⁹ is an apocalyptic number.

388779 is a deficient number, since it is larger than the sum of its proper divisors (129597).

388779 is a wasteful number, since it uses less digits than its factorization.

388779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129596.

The product of its digits is 84672, while the sum is 42.

The square root of 388779 is about 623.5214511146. The cubic root of 388779 is about 72.9851098672.

The spelling of 388779 in words is "three hundred eighty-eight thousand, seven hundred seventy-nine".