39986449 has 2 divisors, whose sum is σ = 39986450. Its totient is φ = 39986448.

The previous prime is 39986413. The next prime is 39986459. The reversal of 39986449 is 94468993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37736449 + 2250000 = 6143^2 + 1500^2 .

It is an emirp because it is prime and its reverse (94468993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39986449 - 2²⁵ = 6432017 is a prime.

It is a super-2 number, since 2×39986449² = 3197832207259202, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 39986396 and 39986405.

It is not a weakly prime, because it can be changed into another prime (39986459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19993224 + 19993225.

It is an arithmetic number, because the mean of its divisors is an integer number (19993225).

Almost surely, 2^39986449 is an apocalyptic number.

It is an amenable number.

39986449 is a deficient number, since it is larger than the sum of its proper divisors (1).

39986449 is an equidigital number, since it uses as much as digits as its factorization.

39986449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1679616, while the sum is 52.

The square root of 39986449 is about 6323.4839289746. The cubic root of 39986449 is about 341.9565651666.

The spelling of 39986449 in words is "thirty-nine million, nine hundred eighty-six thousand, four hundred forty-nine".