388832221 has 4 divisors (see below), whose sum is σ = 396168732. Its totient is φ = 381495712.

The previous prime is 388832201. The next prime is 388832267. The reversal of 388832221 is 122238883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 256352121 + 132480100 = 16011^2 + 11510^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-388832221 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 (388832201) 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, 3668176 + ... + 3668281.

It is an arithmetic number, because the mean of its divisors is an integer number (99042183).

Almost surely, 2^388832221 is an apocalyptic number.

It is an amenable number.

388832221 is a deficient number, since it is larger than the sum of its proper divisors (7336511).

388832221 is an equidigital number, since it uses as much as digits as its factorization.

388832221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7336510.

The product of its digits is 36864, while the sum is 37.

The square root of 388832221 is about 19718.8290980981. The cubic root of 388832221 is about 729.8844009109.

The spelling of 388832221 in words is "three hundred eighty-eight million, eight hundred thirty-two thousand, two hundred twenty-one".