388136826 has 256 divisors, whose sum is σ = 1202688000. Its totient is φ = 89890560.

The previous prime is 388136803. The next prime is 388136849. The reversal of 388136826 is 628631883.

It is an interprime number because it is at equal distance from previous prime (388136803) and next prime (388136849).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 20428245 + ... + 20428263.

It is an arithmetic number, because the mean of its divisors is an integer number (4698000).

Almost surely, 2^388136826 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388136826, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (601344000).

388136826 is an abundant number, since it is smaller than the sum of its proper divisors (814551174).

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

388136826 is a wasteful number, since it uses less digits than its factorization.

388136826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99 (or 59 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 388136826 is about 19701.1884413098. The cubic root of 388136826 is about 729.4490281786.

The spelling of 388136826 in words is "three hundred eighty-eight million, one hundred thirty-six thousand, eight hundred twenty-six".