39906693 has 6 divisors (see below), whose sum is σ = 57643014. Its totient is φ = 26604456.

The previous prime is 39906677. The next prime is 39906743. The reversal of 39906693 is 39660993.

It can be written as a sum of positive squares in only one way, i.e., 20958084 + 18948609 = 4578^2 + 4353^2 .

It is not a de Polignac number, because 39906693 - 2⁴ = 39906677 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39906793) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2217030 + ... + 2217047.

It is an arithmetic number, because the mean of its divisors is an integer number (9607169).

Almost surely, 2^39906693 is an apocalyptic number.

It is an amenable number.

39906693 is a deficient number, since it is larger than the sum of its proper divisors (17736321).

39906693 is a wasteful number, since it uses less digits than its factorization.

39906693 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4434083 (or 4434080 counting only the distinct ones).

The product of its (nonzero) digits is 236196, while the sum is 45.

The square root of 39906693 is about 6317.1744474884. The cubic root of 39906693 is about 341.7290610883.

The spelling of 39906693 in words is "thirty-nine million, nine hundred six thousand, six hundred ninety-three".