388021216 has 24 divisors (see below), whose sum is σ = 833364504. Its totient is φ = 176373120.

The previous prime is 388021213. The next prime is 388021217. The reversal of 388021216 is 612120883.

It is a super-2 number, since 2×388021216² = 301120928132237312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388021213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 550815 + ... + 551518.

It is an arithmetic number, because the mean of its divisors is an integer number (34723521).

Almost surely, 2^388021216 is an apocalyptic number.

It is an amenable number.

388021216 is an abundant number, since it is smaller than the sum of its proper divisors (445343288).

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

388021216 is a wasteful number, since it uses less digits than its factorization.

388021216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102354 (or 1102346 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 31.

The square root of 388021216 is about 19698.2541358365. The cubic root of 388021216 is about 729.3765966966.

The spelling of 388021216 in words is "three hundred eighty-eight million, twenty-one thousand, two hundred sixteen".