39909402629 has 2 divisors, whose sum is σ = 39909402630. Its totient is φ = 39909402628.

The previous prime is 39909402619. The next prime is 39909402647. The reversal of 39909402629 is 92620490993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38957680129 + 951722500 = 197377^2 + 30850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39909402629 is a prime.

It is a super-2 number, since 2×39909402629² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39909402619) 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, 19954701314 + 19954701315.

It is an arithmetic number, because the mean of its divisors is an integer number (19954701315).

Almost surely, 2^39909402629 is an apocalyptic number.

It is an amenable number.

39909402629 is a deficient number, since it is larger than the sum of its proper divisors (1).

39909402629 is an equidigital number, since it uses as much as digits as its factorization.

39909402629 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1889568, while the sum is 53.

The spelling of 39909402629 in words is "thirty-nine billion, nine hundred nine million, four hundred two thousand, six hundred twenty-nine".