388638426 has 64 divisors (see below), whose sum is σ = 914457600. Its totient is φ = 108835200.

The previous prime is 388638421. The next prime is 388638431. The reversal of 388638426 is 624836883.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (388638421) and next prime (388638431).

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (388638421) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 47635 + ... + 55193.

It is an arithmetic number, because the mean of its divisors is an integer number (14288400).

Almost surely, 2^388638426 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388638426, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (457228800).

388638426 is an abundant number, since it is smaller than the sum of its proper divisors (525819174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

388638426 is a wasteful number, since it uses less digits than its factorization.

388638426 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7635.

The product of its digits is 1327104, while the sum is 48.

The square root of 388638426 is about 19713.9145275615. The cubic root of 388638426 is about 729.7631219927.

The spelling of 388638426 in words is "three hundred eighty-eight million, six hundred thirty-eight thousand, four hundred twenty-six".