388740398 has 4 divisors (see below), whose sum is σ = 583110600. Its totient is φ = 194370198.

The previous prime is 388740379. The next prime is 388740413. The reversal of 388740398 is 893047883.

It is a happy number.

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

It is a super-2 number, since 2×388740398² = 302238194074396808, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 97185098 + ... + 97185101.

It is an arithmetic number, because the mean of its divisors is an integer number (145777650).

Almost surely, 2^388740398 is an apocalyptic number.

388740398 is a deficient number, since it is larger than the sum of its proper divisors (194370202).

388740398 is a wasteful number, since it uses less digits than its factorization.

388740398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194370201.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 388740398 is about 19716.5006530064. The cubic root of 388740398 is about 729.8269421510.

The spelling of 388740398 in words is "three hundred eighty-eight million, seven hundred forty thousand, three hundred ninety-eight".