39909479 has 2 divisors, whose sum is σ = 39909480. Its totient is φ = 39909478.

The previous prime is 39909449. The next prime is 39909487. The reversal of 39909479 is 97490993.

39909479 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 39909479 - 2⁸ = 39909223 is a prime.

It is a super-3 number, since 3×39909479³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39909449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19954739 + 19954740.

It is an arithmetic number, because the mean of its divisors is an integer number (19954740).

Almost surely, 2^39909479 is an apocalyptic number.

39909479 is a deficient number, since it is larger than the sum of its proper divisors (1).

39909479 is an equidigital number, since it uses as much as digits as its factorization.

39909479 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 551124, while the sum is 50.

The square root of 39909479 is about 6317.3949536181. The cubic root of 39909479 is about 341.7370132632.

The spelling of 39909479 in words is "thirty-nine million, nine hundred nine thousand, four hundred seventy-nine".