29989987 has 2 divisors, whose sum is σ = 29989988. Its totient is φ = 29989986.

The previous prime is 29989951. The next prime is 29990011. The reversal of 29989987 is 78998992.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 29989987 - 2⁷ = 29989859 is a prime.

It is not a weakly prime, because it can be changed into another prime (29989187) 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 as a sum of consecutive naturals, namely, 14994993 + 14994994.

It is an arithmetic number, because the mean of its divisors is an integer number (14994994).

Almost surely, 2^29989987 is an apocalyptic number.

29989987 is a deficient number, since it is larger than the sum of its proper divisors (1).

29989987 is an equidigital number, since it uses as much as digits as its factorization.

29989987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5878656, while the sum is 61.

The square root of 29989987 is about 5476.3114411071. The cubic root of 29989987 is about 310.6886770607.

It can be divided in two parts, 29989 and 987, that added together give a square (30976 = 176²).

The spelling of 29989987 in words is "twenty-nine million, nine hundred eighty-nine thousand, nine hundred eighty-seven".