29439989 has 2 divisors, whose sum is σ = 29439990. Its totient is φ = 29439988.

The previous prime is 29439979. The next prime is 29440007. The reversal of 29439989 is 98993492.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29343889 + 96100 = 5417^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 29439989 - 2⁴ = 29439973 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29439989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29439979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14719994 + 14719995.

It is an arithmetic number, because the mean of its divisors is an integer number (14719995).

Almost surely, 2^29439989 is an apocalyptic number.

It is an amenable number.

29439989 is a deficient number, since it is larger than the sum of its proper divisors (1).

29439989 is an equidigital number, since it uses as much as digits as its factorization.

29439989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1259712, while the sum is 53.

The square root of 29439989 is about 5425.8629728367. The cubic root of 29439989 is about 308.7776667171. Note that the first 3 decimals are identical.

The spelling of 29439989 in words is "twenty-nine million, four hundred thirty-nine thousand, nine hundred eighty-nine".