40240399 has 2 divisors, whose sum is σ = 40240400. Its totient is φ = 40240398.

The previous prime is 40240397. The next prime is 40240427. The reversal of 40240399 is 99304204.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40240399 - 2¹ = 40240397 is a prime.

Together with 40240397, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 40240399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40240391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20120199 + 20120200.

It is an arithmetic number, because the mean of its divisors is an integer number (20120200).

Almost surely, 2^40240399 is an apocalyptic number.

40240399 is a deficient number, since it is larger than the sum of its proper divisors (1).

40240399 is an equidigital number, since it uses as much as digits as its factorization.

40240399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 40240399 is about 6343.5320602957. The cubic root of 40240399 is about 342.6789488794.

The spelling of 40240399 in words is "forty million, two hundred forty thousand, three hundred ninety-nine".