388650221 has 4 divisors (see below), whose sum is σ = 388719744. Its totient is φ = 388580700.

The previous prime is 388650181. The next prime is 388650233. The reversal of 388650221 is 122056883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388650221 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 (388650271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25565 + ... + 37826.

It is an arithmetic number, because the mean of its divisors is an integer number (97179936).

Almost surely, 2^388650221 is an apocalyptic number.

It is an amenable number.

388650221 is a deficient number, since it is larger than the sum of its proper divisors (69523).

388650221 is an equidigital number, since it uses as much as digits as its factorization.

388650221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69522.

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 388650221 is about 19714.2136794750. The cubic root of 388650221 is about 729.7705045780.

The spelling of 388650221 in words is "three hundred eighty-eight million, six hundred fifty thousand, two hundred twenty-one".