388815 has 36 divisors (see below), whose sum is σ = 756504. Its totient is φ = 170016.

The previous prime is 388813. The next prime is 388823. The reversal of 388815 is 518883.

It is not a de Polignac number, because 388815 - 2¹ = 388813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388813) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 16894 + ... + 16916.

It is an arithmetic number, because the mean of its divisors is an integer number (21014).

2³⁸⁸⁸¹⁵ is an apocalyptic number.

388815 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

388815 is a deficient number, since it is larger than the sum of its proper divisors (367689).

388815 is a wasteful number, since it uses less digits than its factorization.

388815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 38 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 388815 is about 623.5503187394. The cubic root of 388815 is about 72.9873625462.

Adding to 388815 its product of digits (7680), we get a triangular number (396495 = T₈₉₀).

The spelling of 388815 in words is "three hundred eighty-eight thousand, eight hundred fifteen".