39913829 has 2 divisors, whose sum is σ = 39913830. Its totient is φ = 39913828.

The previous prime is 39913817. The next prime is 39913849. The reversal of 39913829 is 92831993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38725729 + 1188100 = 6223^2 + 1090^2 .

It is a cyclic number.

It is not a de Polignac number, because 39913829 - 2¹² = 39909733 is a prime.

It is a super-2 number, since 2×39913829² = 3186227490882482, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 39913829.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39913849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19956914 + 19956915.

It is an arithmetic number, because the mean of its divisors is an integer number (19956915).

Almost surely, 2^39913829 is an apocalyptic number.

It is an amenable number.

39913829 is a deficient number, since it is larger than the sum of its proper divisors (1).

39913829 is an equidigital number, since it uses as much as digits as its factorization.

39913829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 44.

The square root of 39913829 is about 6317.7392317189. The cubic root of 39913829 is about 341.7494288767.

The spelling of 39913829 in words is "thirty-nine million, nine hundred thirteen thousand, eight hundred twenty-nine".