388666 has 8 divisors (see below), whose sum is σ = 585684. Its totient is φ = 193440.

The previous prime is 388657. The next prime is 388673. The reversal of 388666 is 666883.

It can be written as a sum of positive squares in 2 ways, for example, as 385641 + 3025 = 621^2 + 55^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×388666² = 302122519112, which contains 22 as substring.

388666 is a modest number, since divided by 666 gives 388 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486 + ... + 1006.

2³⁸⁸⁶⁶⁶ is an apocalyptic number.

388666 is a deficient number, since it is larger than the sum of its proper divisors (197018).

388666 is a wasteful number, since it uses less digits than its factorization.

388666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 896.

The product of its digits is 41472, while the sum is 37.

The square root of 388666 is about 623.4308301648. The cubic root of 388666 is about 72.9780380547.

The spelling of 388666 in words is "three hundred eighty-eight thousand, six hundred sixty-six".