39807645 has 16 divisors (see below), whose sum is σ = 63789120. Its totient is φ = 21198464.

The previous prime is 39807643. The next prime is 39807661. The reversal of 39807645 is 54670893.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 39807645 - 2¹ = 39807643 is a prime.

It is a super-4 number, since 4×39807645⁴ (a number of 32 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39807597 and 39807606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39807643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10801 + ... + 14009.

It is an arithmetic number, because the mean of its divisors is an integer number (3986820).

Almost surely, 2^39807645 is an apocalyptic number.

It is an amenable number.

39807645 is a deficient number, since it is larger than the sum of its proper divisors (23981475).

39807645 is a wasteful number, since it uses less digits than its factorization.

39807645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4044.

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 39807645 is about 6309.3299961248. The cubic root of 39807645 is about 341.4461041932.

The spelling of 39807645 in words is "thirty-nine million, eight hundred seven thousand, six hundred forty-five".