29943989 has 4 divisors (see below), whose sum is σ = 30753324. Its totient is φ = 29134656.

The previous prime is 29943973. The next prime is 29944003. The reversal of 29943989 is 98934992.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21003889 + 8940100 = 4583^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 29943989 - 2⁴ = 29943973 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 29943989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29943929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 404612 + ... + 404685.

It is an arithmetic number, because the mean of its divisors is an integer number (7688331).

Almost surely, 2^29943989 is an apocalyptic number.

It is an amenable number.

29943989 is a deficient number, since it is larger than the sum of its proper divisors (809335).

29943989 is an equidigital number, since it uses as much as digits as its factorization.

29943989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809334.

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

The square root of 29943989 is about 5472.1101048864. The cubic root of 29943989 is about 310.5297532346.

The spelling of 29943989 in words is "twenty-nine million, nine hundred forty-three thousand, nine hundred eighty-nine".