388116021 has 16 divisors (see below), whose sum is σ = 545192640. Its totient is φ = 244915200.

The previous prime is 388116017. The next prime is 388116023. The reversal of 388116021 is 120611883.

It is not a de Polignac number, because 388116021 - 2² = 388116017 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 388116021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388116023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89131 + ... + 93383.

It is an arithmetic number, because the mean of its divisors is an integer number (34074540).

Almost surely, 2^388116021 is an apocalyptic number.

It is an amenable number.

388116021 is a deficient number, since it is larger than the sum of its proper divisors (157076619).

388116021 is a wasteful number, since it uses less digits than its factorization.

388116021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5876.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 388116021 is about 19700.6604204022. The cubic root of 388116021 is about 729.4359945805.

The spelling of 388116021 in words is "three hundred eighty-eight million, one hundred sixteen thousand, twenty-one".