388978 has 8 divisors (see below), whose sum is σ = 597168. Its totient is φ = 189924.

The previous prime is 388963. The next prime is 388991. The reversal of 388978 is 879883.

It is a happy number.

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

It is a Harshad number since it is a multiple of its sum of digits (43).

It is an unprimeable number.

388978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2176 + ... + 2347.

It is an arithmetic number, because the mean of its divisors is an integer number (74646).

2³⁸⁸⁹⁷⁸ is an apocalyptic number.

388978 is a deficient number, since it is larger than the sum of its proper divisors (208190).

388978 is a wasteful number, since it uses less digits than its factorization.

388978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4568.

The product of its digits is 96768, while the sum is 43.

The square root of 388978 is about 623.6810082085. The cubic root of 388978 is about 72.9975604364.

The spelling of 388978 in words is "three hundred eighty-eight thousand, nine hundred seventy-eight".