388990 has 16 divisors (see below), whose sum is σ = 800352. Its totient is φ = 133344.

The previous prime is 388963. The next prime is 388991. The reversal of 388990 is 99883.

388990 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388991) by changing a digit.

388990 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 7 ways as a sum of consecutive naturals, for example, 2709 + ... + 2848.

It is an arithmetic number, because the mean of its divisors is an integer number (50022).

2³⁸⁸⁹⁹⁰ is an apocalyptic number.

388990 is an abundant number, since it is smaller than the sum of its proper divisors (411362).

It is a weird number, because it is abundant, but not a pseudoperfect number.

388990 is a wasteful number, since it uses less digits than its factorization.

388990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5571.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 388990 is about 623.6906284369. The cubic root of 388990 is about 72.9983110887.

It can be divided in two parts, 388 and 990, that added together give a triangular number (1378 = T₅₂).

The spelling of 388990 in words is "three hundred eighty-eight thousand, nine hundred ninety".