38688399 has 12 divisors (see below), whose sum is σ = 55973112. Its totient is φ = 25750800.

The previous prime is 38688367. The next prime is 38688401. The reversal of 38688399 is 99388683.

It is a Cunningham number, because it is equal to 6220²-1.

It is not a de Polignac number, because 38688399 - 2⁵ = 38688367 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (38688499) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3109 + ... + 9329.

It is an arithmetic number, because the mean of its divisors is an integer number (4664426).

Almost surely, 2^38688399 is an apocalyptic number.

38688399 is a deficient number, since it is larger than the sum of its proper divisors (17284713).

38688399 is a wasteful number, since it uses less digits than its factorization.

38688399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6918 (or 6915 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 38688399 is about 6219.9999196141. Note that the first 4 decimals coincide. The cubic root of 38688399 is about 338.2155616418.

The spelling of 38688399 in words is "thirty-eight million, six hundred eighty-eight thousand, three hundred ninety-nine".