8139829 has 2 divisors, whose sum is σ = 8139830. Its totient is φ = 8139828.

The previous prime is 8139797. The next prime is 8139869. The reversal of 8139829 is 9289318.

It is an a-pointer prime, because the next prime (8139869) can be obtained adding 8139829 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5808100 + 2331729 = 2410^2 + 1527^2 .

It is a cyclic number.

It is not a de Polignac number, because 8139829 - 2⁵ = 8139797 is a prime.

It is a super-2 number, since 2×8139829² = 132513632298482, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8139791 and 8139800.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8139869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4069914 + 4069915.

It is an arithmetic number, because the mean of its divisors is an integer number (4069915).

Almost surely, 2^8139829 is an apocalyptic number.

It is an amenable number.

8139829 is a deficient number, since it is larger than the sum of its proper divisors (1).

8139829 is an equidigital number, since it uses as much as digits as its factorization.

8139829 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 40.

The square root of 8139829 is about 2853.0385556455. The cubic root of 8139829 is about 201.1585178905.

The spelling of 8139829 in words is "eight million, one hundred thirty-nine thousand, eight hundred twenty-nine".