388394789 has 4 divisors (see below), whose sum is σ = 408836640. Its totient is φ = 367952940.

The previous prime is 388394777. The next prime is 388394803. The reversal of 388394789 is 987493883.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 987493883 = 10433 ⋅94651.

It is a cyclic number.

It is not a de Polignac number, because 388394789 - 2²⁰ = 387346213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388394729) 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, 10220897 + ... + 10220934.

It is an arithmetic number, because the mean of its divisors is an integer number (102209160).

Almost surely, 2^388394789 is an apocalyptic number.

It is an amenable number.

388394789 is a deficient number, since it is larger than the sum of its proper divisors (20441851).

388394789 is a wasteful number, since it uses less digits than its factorization.

388394789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20441850.

The product of its digits is 10450944, while the sum is 59.

The square root of 388394789 is about 19707.7342431848. The cubic root of 388394789 is about 729.6105942167.

The spelling of 388394789 in words is "three hundred eighty-eight million, three hundred ninety-four thousand, seven hundred eighty-nine".