240638369 has 2 divisors, whose sum is σ = 240638370. Its totient is φ = 240638368.

The previous prime is 240638347. The next prime is 240638371. The reversal of 240638369 is 963836042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 234487969 + 6150400 = 15313^2 + 2480^2 .

It is a cyclic number.

It is not a de Polignac number, because 240638369 - 2¹⁶ = 240572833 is a prime.

It is a super-2 number, since 2×240638369² = 115813649269960322, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 240638371, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (240638309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120319184 + 120319185.

It is an arithmetic number, because the mean of its divisors is an integer number (120319185).

Almost surely, 2^240638369 is an apocalyptic number.

It is an amenable number.

240638369 is a deficient number, since it is larger than the sum of its proper divisors (1).

240638369 is an equidigital number, since it uses as much as digits as its factorization.

240638369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 240638369 is about 15512.5229733915. The cubic root of 240638369 is about 621.9970025324.

The spelling of 240638369 in words is "two hundred forty million, six hundred thirty-eight thousand, three hundred sixty-nine".