39668138 has 8 divisors (see below), whose sum is σ = 59592132. Its totient is φ = 19804096.

The previous prime is 39668137. The next prime is 39668147. The reversal of 39668138 is 83186693.

39668138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 31956409 + 7711729 = 5653^2 + 2777^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×39668138² = 3147122344774088, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (39668131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13295 + ... + 16002.

Almost surely, 2^39668138 is an apocalyptic number.

39668138 is a deficient number, since it is larger than the sum of its proper divisors (19923994).

39668138 is a wasteful number, since it uses less digits than its factorization.

39668138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29976.

The product of its digits is 186624, while the sum is 44.

The square root of 39668138 is about 6298.2646816405. The cubic root of 39668138 is about 341.0467682090.

The spelling of 39668138 in words is "thirty-nine million, six hundred sixty-eight thousand, one hundred thirty-eight".