240009989 has 2 divisors, whose sum is σ = 240009990. Its totient is φ = 240009988.

The previous prime is 240009977. The next prime is 240009997. The reversal of 240009989 is 989900042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 237930625 + 2079364 = 15425^2 + 1442^2 .

It is a cyclic number.

It is not a de Polignac number, because 240009989 - 2⁸ = 240009733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240002989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120004994 + 120004995.

It is an arithmetic number, because the mean of its divisors is an integer number (120004995).

Almost surely, 2^240009989 is an apocalyptic number.

It is an amenable number.

240009989 is a deficient number, since it is larger than the sum of its proper divisors (1).

240009989 is an equidigital number, since it uses as much as digits as its factorization.

240009989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 240009989 is about 15492.2557750639. The cubic root of 240009989 is about 621.4551227782.

The spelling of 240009989 in words is "two hundred forty million, nine thousand, nine hundred eighty-nine".