388690 has 16 divisors (see below), whose sum is σ = 715392. Its totient is φ = 151984.

The previous prime is 388673. The next prime is 388691. The reversal of 388690 is 96883.

It is a super-2 number, since 2×388690² = 302159832200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57 + ... + 883.

It is an arithmetic number, because the mean of its divisors is an integer number (44712).

2³⁸⁸⁶⁹⁰ is an apocalyptic number.

388690 is a deficient number, since it is larger than the sum of its proper divisors (326702).

388690 is a wasteful number, since it uses less digits than its factorization.

388690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 881.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 388690 is about 623.4500781939. The cubic root of 388690 is about 72.9795401472.

The spelling of 388690 in words is "three hundred eighty-eight thousand, six hundred ninety".