39968249 has 2 divisors, whose sum is σ = 39968250. Its totient is φ = 39968248.

The previous prime is 39968221. The next prime is 39968261. The reversal of 39968249 is 94286993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32569849 + 7398400 = 5707^2 + 2720^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39968249 is a prime.

It is a super-3 number, since 3×39968249³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 39968197 and 39968206.

It is not a weakly prime, because it can be changed into another prime (39968219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19984124 + 19984125.

It is an arithmetic number, because the mean of its divisors is an integer number (19984125).

Almost surely, 2^39968249 is an apocalyptic number.

It is an amenable number.

39968249 is a deficient number, since it is larger than the sum of its proper divisors (1).

39968249 is an equidigital number, since it uses as much as digits as its factorization.

39968249 is an evil number, because the sum of its binary digits is even.

The product of its digits is 839808, while the sum is 50.

The square root of 39968249 is about 6322.0446850683. The cubic root of 39968249 is about 341.9046763050.

The spelling of 39968249 in words is "thirty-nine million, nine hundred sixty-eight thousand, two hundred forty-nine".