29999989 has 2 divisors, whose sum is σ = 29999990. Its totient is φ = 29999988.

The previous prime is 29999947. The next prime is 29999999. The reversal of 29999989 is 98999992.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29343889 + 656100 = 5417^2 + 810^2 .

It is a cyclic number.

It is not a de Polignac number, because 29999989 - 2⁹ = 29999477 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29999989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29999999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14999994 + 14999995.

It is an arithmetic number, because the mean of its divisors is an integer number (14999995).

Almost surely, 2^29999989 is an apocalyptic number.

It is an amenable number.

29999989 is a deficient number, since it is larger than the sum of its proper divisors (1).

29999989 is an equidigital number, since it uses as much as digits as its factorization.

29999989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8503056, while the sum is 64.

The square root of 29999989 is about 5477.2245708935. The cubic root of 29999989 is about 310.7232126181.

The spelling of 29999989 in words is "twenty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-nine".