388861644 has 96 divisors (see below), whose sum is σ = 999161856. Its totient is φ = 117311040.

The previous prime is 388861643. The next prime is 388861661. The reversal of 388861644 is 446168883.

It is a junction number, because it is equal to n+sod(n) for n = 388861593 and 388861602.

It is not an unprimeable number, because it can be changed into a prime (388861643) 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, 401649 + ... + 402615.

It is an arithmetic number, because the mean of its divisors is an integer number (10407936).

Almost surely, 2^388861644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 388861644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (499580928).

388861644 is an abundant number, since it is smaller than the sum of its proper divisors (610300212).

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

388861644 is a wasteful number, since it uses less digits than its factorization.

388861644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1075 (or 1073 counting only the distinct ones).

The product of its digits is 884736, while the sum is 48.

The square root of 388861644 is about 19719.5751475533. The cubic root of 388861644 is about 729.9028106053.

The spelling of 388861644 in words is "three hundred eighty-eight million, eight hundred sixty-one thousand, six hundred forty-four".