39805189 has 2 divisors, whose sum is σ = 39805190. Its totient is φ = 39805188.

The previous prime is 39805163. The next prime is 39805237. The reversal of 39805189 is 98150893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32148900 + 7656289 = 5670^2 + 2767^2 .

It is a cyclic number.

It is not a de Polignac number, because 39805189 - 2⁷ = 39805061 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39805289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19902594 + 19902595.

It is an arithmetic number, because the mean of its divisors is an integer number (19902595).

Almost surely, 2^39805189 is an apocalyptic number.

It is an amenable number.

39805189 is a deficient number, since it is larger than the sum of its proper divisors (1).

39805189 is an equidigital number, since it uses as much as digits as its factorization.

39805189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 39805189 is about 6309.1353607289. The cubic root of 39805189 is about 341.4390820171.

The spelling of 39805189 in words is "thirty-nine million, eight hundred five thousand, one hundred eighty-nine".