388121916 has 96 divisors (see below), whose sum is σ = 1123064320. Its totient is φ = 101585664.

The previous prime is 388121869. The next prime is 388121927. The reversal of 388121916 is 619121883.

It is a super-2 number, since 2×388121916² = 301277243359022112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150510 + ... + 153066.

Almost surely, 2^388121916 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 388121916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (561532160).

388121916 is an abundant number, since it is smaller than the sum of its proper divisors (734942404).

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

388121916 is a wasteful number, since it uses less digits than its factorization.

388121916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723 (or 2721 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 388121916 is about 19700.8100341077. The cubic root of 388121916 is about 729.4396876372.

The spelling of 388121916 in words is "three hundred eighty-eight million, one hundred twenty-one thousand, nine hundred sixteen".