39809997 has 18 divisors (see below), whose sum is σ = 60694062. Its totient is φ = 25141104.

The previous prime is 39809989. The next prime is 39809999. The reversal of 39809997 is 79990893.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 33802596 + 6007401 = 5814^2 + 2451^2 .

It is not a de Polignac number, because 39809997 - 2³ = 39809989 is a prime.

It is a super-2 number, since 2×39809997² = 3169671722280018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39809999) 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 17 ways as a sum of consecutive naturals, for example, 2878 + ... + 9375.

Almost surely, 2^39809997 is an apocalyptic number.

It is an amenable number.

39809997 is a deficient number, since it is larger than the sum of its proper divisors (20884065).

39809997 is a wasteful number, since it uses less digits than its factorization.

39809997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12297 (or 12275 counting only the distinct ones).

The product of its (nonzero) digits is 1102248, while the sum is 54.

The square root of 39809997 is about 6309.5163840028. The cubic root of 39809997 is about 341.4528287425.

The spelling of 39809997 in words is "thirty-nine million, eight hundred nine thousand, nine hundred ninety-seven".