40555399 has 2 divisors, whose sum is σ = 40555400. Its totient is φ = 40555398.

The previous prime is 40555397. The next prime is 40555433. The reversal of 40555399 is 99355504.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40555399 - 2¹ = 40555397 is a prime.

Together with 40555397, 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 (40555391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20277699 + 20277700.

It is an arithmetic number, because the mean of its divisors is an integer number (20277700).

Almost surely, 2^40555399 is an apocalyptic number.

40555399 is a deficient number, since it is larger than the sum of its proper divisors (1).

40555399 is an equidigital number, since it uses as much as digits as its factorization.

40555399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 40555399 is about 6368.3120997640. The cubic root of 40555399 is about 343.5707842010.

The spelling of 40555399 in words is "forty million, five hundred fifty-five thousand, three hundred ninety-nine".