388709997 has 16 divisors (see below), whose sum is σ = 577395840. Its totient is φ = 230956992.

The previous prime is 388709987. The next prime is 388710001. The reversal of 388709997 is 799907883.

It is a happy number.

It is not a de Polignac number, because 388709997 - 2⁶ = 388709933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 388709997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (388709927) 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, 170713 + ... + 172974.

It is an arithmetic number, because the mean of its divisors is an integer number (36087240).

Almost surely, 2^388709997 is an apocalyptic number.

It is an amenable number.

388709997 is a deficient number, since it is larger than the sum of its proper divisors (188685843).

388709997 is a wasteful number, since it uses less digits than its factorization.

388709997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343732.

The product of its (nonzero) digits is 6858432, while the sum is 60.

The square root of 388709997 is about 19715.7296846959. The cubic root of 388709997 is about 729.8079165602.

The spelling of 388709997 in words is "three hundred eighty-eight million, seven hundred nine thousand, nine hundred ninety-seven".