40345399 has 2 divisors, whose sum is σ = 40345400. Its totient is φ = 40345398.

The previous prime is 40345397. The next prime is 40345423. The reversal of 40345399 is 99354304.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40345399 - 2¹ = 40345397 is a prime.

Together with 40345397, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40345397) 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 as a sum of consecutive naturals, namely, 20172699 + 20172700.

It is an arithmetic number, because the mean of its divisors is an integer number (20172700).

Almost surely, 2^40345399 is an apocalyptic number.

40345399 is a deficient number, since it is larger than the sum of its proper divisors (1).

40345399 is an equidigital number, since it uses as much as digits as its factorization.

40345399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

The square root of 40345399 is about 6351.8028149495. The cubic root of 40345399 is about 342.9767428068.

The spelling of 40345399 in words is "forty million, three hundred forty-five thousand, three hundred ninety-nine".