243129986 has 16 divisors (see below), whose sum is σ = 403455168. Its totient is φ = 108956400.

The previous prime is 243129983. The next prime is 243129989. The reversal of 243129986 is 689921342.

It is an interprime number because it is at equal distance from previous prime (243129983) and next prime (243129989).

It is a super-2 number, since 2×243129986² = 118224380184720392, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (243129983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76265 + ... + 79388.

It is an arithmetic number, because the mean of its divisors is an integer number (25215948).

Almost surely, 2^243129986 is an apocalyptic number.

243129986 is a deficient number, since it is larger than the sum of its proper divisors (160325182).

243129986 is a wasteful number, since it uses less digits than its factorization.

243129986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155737.

The product of its digits is 186624, while the sum is 44.

The square root of 243129986 is about 15592.6260136001. The cubic root of 243129986 is about 624.1363953020.

The spelling of 243129986 in words is "two hundred forty-three million, one hundred twenty-nine thousand, nine hundred eighty-six".