388267217 has 16 divisors (see below), whose sum is σ = 428717520. Its totient is φ = 349443072.

The previous prime is 388267213. The next prime is 388267247. The reversal of 388267217 is 712762883.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 118026496 + 270240721 = 10864^2 + 16439^2 .

It is a cyclic number.

It is not a de Polignac number, because 388267217 - 2² = 388267213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (388267213) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82163 + ... + 86759.

It is an arithmetic number, because the mean of its divisors is an integer number (26794845).

Almost surely, 2^388267217 is an apocalyptic number.

It is an amenable number.

388267217 is a deficient number, since it is larger than the sum of its proper divisors (40450303).

388267217 is a wasteful number, since it uses less digits than its factorization.

388267217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4772.

The product of its digits is 225792, while the sum is 44.

The square root of 388267217 is about 19704.4973800399. The cubic root of 388267217 is about 729.5307029326.

The spelling of 388267217 in words is "three hundred eighty-eight million, two hundred sixty-seven thousand, two hundred seventeen".