39987449 has 2 divisors, whose sum is σ = 39987450. Its totient is φ = 39987448.

The previous prime is 39987407. The next prime is 39987473. The reversal of 39987449 is 94478993.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28015849 + 11971600 = 5293^2 + 3460^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39987449 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39987449.

It is not a weakly prime, because it can be changed into another prime (39987499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19993724 + 19993725.

It is an arithmetic number, because the mean of its divisors is an integer number (19993725).

Almost surely, 2^39987449 is an apocalyptic number.

It is an amenable number.

39987449 is a deficient number, since it is larger than the sum of its proper divisors (1).

39987449 is an equidigital number, since it uses as much as digits as its factorization.

39987449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 39987449 is about 6323.5629988164. The cubic root of 39987449 is about 341.9594157466.

The spelling of 39987449 in words is "thirty-nine million, nine hundred eighty-seven thousand, four hundred forty-nine".