240990689 has 2 divisors, whose sum is σ = 240990690. Its totient is φ = 240990688.

The previous prime is 240990679. The next prime is 240990697. The reversal of 240990689 is 986099042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215062225 + 25928464 = 14665^2 + 5092^2 .

It is a cyclic number.

It is not a de Polignac number, because 240990689 - 2²⁰ = 239942113 is a prime.

It is not a weakly prime, because it can be changed into another prime (240990649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120495344 + 120495345.

It is an arithmetic number, because the mean of its divisors is an integer number (120495345).

Almost surely, 2^240990689 is an apocalyptic number.

It is an amenable number.

240990689 is a deficient number, since it is larger than the sum of its proper divisors (1).

240990689 is an equidigital number, since it uses as much as digits as its factorization.

240990689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 47.

The square root of 240990689 is about 15523.8748062460. The cubic root of 240990689 is about 622.3004109522.

The spelling of 240990689 in words is "two hundred forty million, nine hundred ninety thousand, six hundred eighty-nine".