388778 has 16 divisors (see below), whose sum is σ = 661920. Its totient is φ = 169776.

The previous prime is 388777. The next prime is 388781. The reversal of 388778 is 877883.

It is a super-2 number, since 2×388778² = 302296666568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 101 + ... + 887.

It is an arithmetic number, because the mean of its divisors is an integer number (41370).

2³⁸⁸⁷⁷⁸ is an apocalyptic number.

388778 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

388778 is a deficient number, since it is larger than the sum of its proper divisors (273142).

388778 is a wasteful number, since it uses less digits than its factorization.

388778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 821.

The product of its digits is 75264, while the sum is 41.

The square root of 388778 is about 623.5206492170. The cubic root of 388778 is about 72.9850472908.

The spelling of 388778 in words is "three hundred eighty-eight thousand, seven hundred seventy-eight".