388890938 has 4 divisors (see below), whose sum is σ = 583336410. Its totient is φ = 194445468.

The previous prime is 388890937. The next prime is 388890941. The reversal of 388890938 is 839098883.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 374925769 + 13965169 = 19363^2 + 3737^2 .

It is not an unprimeable number, because it can be changed into a prime (388890937) by changing a digit.

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 as a sum of consecutive naturals, namely, 97222733 + ... + 97222736.

Almost surely, 2^388890938 is an apocalyptic number.

388890938 is a deficient number, since it is larger than the sum of its proper divisors (194445472).

388890938 is a wasteful number, since it uses less digits than its factorization.

388890938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194445471.

The product of its (nonzero) digits is 2985984, while the sum is 56.

The square root of 388890938 is about 19720.3178980462. The cubic root of 388890938 is about 729.9211386631.

The spelling of 388890938 in words is "three hundred eighty-eight million, eight hundred ninety thousand, nine hundred thirty-eight".