39808669 has 4 divisors (see below), whose sum is σ = 40734496. Its totient is φ = 38882844.

The previous prime is 39808649. The next prime is 39808687. The reversal of 39808669 is 96680893.

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: 96680893 = 389 ⋅248537.

It is a cyclic number.

It is not a de Polignac number, because 39808669 - 2⁷ = 39808541 is a prime.

It is a super-2 number, since 2×39808669² = 3169460255103122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39808609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462849 + ... + 462934.

It is an arithmetic number, because the mean of its divisors is an integer number (10183624).

Almost surely, 2^39808669 is an apocalyptic number.

It is an amenable number.

39808669 is a deficient number, since it is larger than the sum of its proper divisors (925827).

39808669 is an equidigital number, since it uses as much as digits as its factorization.

39808669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 925826.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 39808669 is about 6309.4111452655. The cubic root of 39808669 is about 341.4490319207.

The spelling of 39808669 in words is "thirty-nine million, eight hundred eight thousand, six hundred sixty-nine".