388261 has 4 divisors (see below), whose sum is σ = 390892. Its totient is φ = 385632.

The previous prime is 388259. The next prime is 388273. The reversal of 388261 is 162883.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 162883 = 7 ⋅23269.

It can be written as a sum of positive squares in 2 ways, for example, as 202500 + 185761 = 450^2 + 431^2 .

It is a cyclic number.

It is not a de Polignac number, because 388261 - 2¹ = 388259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388211) 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 3 ways as a sum of consecutive naturals, for example, 1080 + ... + 1393.

It is an arithmetic number, because the mean of its divisors is an integer number (97723).

2³⁸⁸²⁶¹ is an apocalyptic number.

It is an amenable number.

388261 is a deficient number, since it is larger than the sum of its proper divisors (2631).

388261 is a wasteful number, since it uses less digits than its factorization.

388261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2630.

The product of its digits is 2304, while the sum is 28.

The square root of 388261 is about 623.1059299991. The cubic root of 388261 is about 72.9526809122.

The spelling of 388261 in words is "three hundred eighty-eight thousand, two hundred sixty-one".