39447949 has 2 divisors, whose sum is σ = 39447950. Its totient is φ = 39447948.

The previous prime is 39447943. The next prime is 39447983. The reversal of 39447949 is 94974493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36360900 + 3087049 = 6030^2 + 1757^2 .

It is a cyclic number.

It is not a de Polignac number, because 39447949 - 2⁹ = 39447437 is a prime.

It is a super-2 number, since 2×39447949² = 3112281360613202, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39447943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19723974 + 19723975.

It is an arithmetic number, because the mean of its divisors is an integer number (19723975).

Almost surely, 2^39447949 is an apocalyptic number.

It is an amenable number.

39447949 is a deficient number, since it is larger than the sum of its proper divisors (1).

39447949 is an equidigital number, since it uses as much as digits as its factorization.

39447949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 49.

The square root of 39447949 is about 6280.7602246862. The cubic root of 39447949 is about 340.4145721490.

The spelling of 39447949 in words is "thirty-nine million, four hundred forty-seven thousand, nine hundred forty-nine".