29939989 has 2 divisors, whose sum is σ = 29939990. Its totient is φ = 29939988.

The previous prime is 29939983. The next prime is 29940013. The reversal of 29939989 is 98993992.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29517489 + 422500 = 5433^2 + 650^2 .

It is a cyclic number.

It is not a de Polignac number, because 29939989 - 2⁵ = 29939957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29939983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14969994 + 14969995.

It is an arithmetic number, because the mean of its divisors is an integer number (14969995).

Almost surely, 2^29939989 is an apocalyptic number.

It is an amenable number.

29939989 is a deficient number, since it is larger than the sum of its proper divisors (1).

29939989 is an equidigital number, since it uses as much as digits as its factorization.

29939989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2834352, while the sum is 58.

The square root of 29939989 is about 5471.7446029580. The cubic root of 29939989 is about 310.5159254808.

The spelling of 29939989 in words is "twenty-nine million, nine hundred thirty-nine thousand, nine hundred eighty-nine".