388888820 has 12 divisors (see below), whose sum is σ = 816666564. Its totient is φ = 155555520.

The previous prime is 388888771. The next prime is 388888867. The reversal of 388888820 is 28888883.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 99480676 + 289408144 = 9974^2 + 17012^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9722201 + ... + 9722240.

It is an arithmetic number, because the mean of its divisors is an integer number (68055547).

Almost surely, 2^388888820 is an apocalyptic number.

It is an amenable number.

388888820 is an abundant number, since it is smaller than the sum of its proper divisors (427777744).

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

388888820 is a wasteful number, since it uses less digits than its factorization.

388888820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19444450 (or 19444448 counting only the distinct ones).

The product of its (nonzero) digits is 1572864, while the sum is 53.

The square root of 388888820 is about 19720.2641970132. The cubic root of 388888820 is about 729.9198135479.

The spelling of 388888820 in words is "three hundred eighty-eight million, eight hundred eighty-eight thousand, eight hundred twenty".