388820 has 12 divisors (see below), whose sum is σ = 816564. Its totient is φ = 155520.

The previous prime is 388813. The next prime is 388823. The reversal of 388820 is 28883.

It can be written as a sum of positive squares in 2 ways, for example, as 114244 + 274576 = 338^2 + 524^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388823) by changing a digit.

388820 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9701 + ... + 9740.

It is an arithmetic number, because the mean of its divisors is an integer number (68047).

2³⁸⁸⁸²⁰ is an apocalyptic number.

It is an amenable number.

388820 is an abundant number, since it is smaller than the sum of its proper divisors (427744).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388820 is a wasteful number, since it uses less digits than its factorization.

388820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19450 (or 19448 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 388820 is about 623.5543280260. The cubic root of 388820 is about 72.9876754073.

The spelling of 388820 in words is "three hundred eighty-eight thousand, eight hundred twenty".