388090 has 12 divisors (see below), whose sum is σ = 702126. Its totient is φ = 154448.

The previous prime is 388081. The next prime is 388099. The reversal of 388090 is 90883.

It is an interprime number because it is at equal distance from previous prime (388081) and next prime (388099).

It can be written as a sum of positive squares in 3 ways, for example, as 375769 + 12321 = 613^2 + 111^2 .

It is a super-2 number, since 2×388090² = 301227696200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (388099) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1872 + ... + 2068.

2³⁸⁸⁰⁹⁰ is an apocalyptic number.

388090 is a deficient number, since it is larger than the sum of its proper divisors (314036).

388090 is an equidigital number, since it uses as much as digits as its factorization.

388090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 388090 is about 622.9686990532. The cubic root of 388090 is about 72.9419692687.

It can be divided in two parts, 38 and 8090, that added together give a triangular number (8128 = T₁₂₇).

The spelling of 388090 in words is "three hundred eighty-eight thousand, ninety".