40421399 has 2 divisors, whose sum is σ = 40421400. Its totient is φ = 40421398.

The previous prime is 40421383. The next prime is 40421411. The reversal of 40421399 is 99312404.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40421399 - 2⁴ = 40421383 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40421309) 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, 20210699 + 20210700.

It is an arithmetic number, because the mean of its divisors is an integer number (20210700).

Almost surely, 2^40421399 is an apocalyptic number.

40421399 is a deficient number, since it is larger than the sum of its proper divisors (1).

40421399 is an equidigital number, since it uses as much as digits as its factorization.

40421399 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 32.

The square root of 40421399 is about 6357.7825536896. The cubic root of 40421399 is about 343.1919667061.

The spelling of 40421399 in words is "forty million, four hundred twenty-one thousand, three hundred ninety-nine".