39899161 has 2 divisors, whose sum is σ = 39899162. Its totient is φ = 39899160.

The previous prime is 39899159. The next prime is 39899173. The reversal of 39899161 is 16199893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30869136 + 9030025 = 5556^2 + 3005^2 .

It is a cyclic number.

It is not a de Polignac number, because 39899161 - 2¹ = 39899159 is a prime.

Together with 39899159, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39899131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19949580 + 19949581.

It is an arithmetic number, because the mean of its divisors is an integer number (19949581).

Almost surely, 2^39899161 is an apocalyptic number.

It is an amenable number.

39899161 is a deficient number, since it is larger than the sum of its proper divisors (1).

39899161 is an equidigital number, since it uses as much as digits as its factorization.

39899161 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 46.

The square root of 39899161 is about 6316.5782667517. The cubic root of 39899161 is about 341.7075603905.

The spelling of 39899161 in words is "thirty-nine million, eight hundred ninety-nine thousand, one hundred sixty-one".