39805849 has 2 divisors, whose sum is σ = 39805850. Its totient is φ = 39805848.

The previous prime is 39805837. The next prime is 39805853. The reversal of 39805849 is 94850893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35105625 + 4700224 = 5925^2 + 2168^2 .

It is a cyclic number.

It is not a de Polignac number, because 39805849 - 2¹⁷ = 39674777 is a prime.

It is a super-2 number, since 2×39805849² = 3169011229221602, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39805799 and 39805808.

It is not a weakly prime, because it can be changed into another prime (39805859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19902924 + 19902925.

It is an arithmetic number, because the mean of its divisors is an integer number (19902925).

Almost surely, 2^39805849 is an apocalyptic number.

It is an amenable number.

39805849 is a deficient number, since it is larger than the sum of its proper divisors (1).

39805849 is an equidigital number, since it uses as much as digits as its factorization.

39805849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 39805849 is about 6309.1876656191. The cubic root of 39805849 is about 341.4409691123.

The spelling of 39805849 in words is "thirty-nine million, eight hundred five thousand, eight hundred forty-nine".