388948109 has 4 divisors (see below), whose sum is σ = 424307040. Its totient is φ = 353589180.

The previous prime is 388948097. The next prime is 388948123. The reversal of 388948109 is 901849883.

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: 901849883 = 11 ⋅81986353.

It is a cyclic number.

It is not a de Polignac number, because 388948109 - 2⁴ = 388948093 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 (388948129) 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, 17679449 + ... + 17679470.

It is an arithmetic number, because the mean of its divisors is an integer number (106076760).

Almost surely, 2^388948109 is an apocalyptic number.

It is an amenable number.

388948109 is a deficient number, since it is larger than the sum of its proper divisors (35358931).

388948109 is a wasteful number, since it uses less digits than its factorization.

388948109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35358930.

The product of its (nonzero) digits is 497664, while the sum is 50.

The square root of 388948109 is about 19721.7673903735. The cubic root of 388948109 is about 729.9569055689.

The spelling of 388948109 in words is "three hundred eighty-eight million, nine hundred forty-eight thousand, one hundred nine".