388240281 has 48 divisors (see below), whose sum is σ = 693551040. Its totient is φ = 205752960.

The previous prime is 388240273. The next prime is 388240331. The reversal of 388240281 is 182042883.

It is a happy number.

It is not a de Polignac number, because 388240281 - 2³ = 388240273 is a prime.

It is a super-2 number, since 2×388240281² = 301461031581917922, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (388240201) by changing a digit.

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 47 ways as a sum of consecutive naturals, for example, 16515 + ... + 32391.

It is an arithmetic number, because the mean of its divisors is an integer number (14448980).

Almost surely, 2^388240281 is an apocalyptic number.

It is an amenable number.

388240281 is a deficient number, since it is larger than the sum of its proper divisors (305310759).

388240281 is a wasteful number, since it uses less digits than its factorization.

388240281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15926 (or 15923 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 388240281 is about 19703.8138694010. The cubic root of 388240281 is about 729.5138321689.

It can be divided in two parts, 388240 and 281, that added together give a triangular number (388521 = T₈₈₁).

The spelling of 388240281 in words is "three hundred eighty-eight million, two hundred forty thousand, two hundred eighty-one".