39429139 has 2 divisors, whose sum is σ = 39429140. Its totient is φ = 39429138.

The previous prime is 39429133. The next prime is 39429149. The reversal of 39429139 is 93192493.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39429139 is a prime.

It is not a weakly prime, because it can be changed into another prime (39429133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19714569 + 19714570.

It is an arithmetic number, because the mean of its divisors is an integer number (19714570).

Almost surely, 2^39429139 is an apocalyptic number.

39429139 is a deficient number, since it is larger than the sum of its proper divisors (1).

39429139 is an equidigital number, since it uses as much as digits as its factorization.

39429139 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52488, while the sum is 40.

The square root of 39429139 is about 6279.2626159446. The cubic root of 39429139 is about 340.3604568208.

The spelling of 39429139 in words is "thirty-nine million, four hundred twenty-nine thousand, one hundred thirty-nine".