40440019 has 2 divisors, whose sum is σ = 40440020. Its totient is φ = 40440018.

The previous prime is 40440017. The next prime is 40440077. The reversal of 40440019 is 91004404.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40440019 - 2¹ = 40440017 is a prime.

It is a super-2 number, since 2×40440019² = 3270790273440722, which contains 22 as substring.

Together with 40440017, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (40440013) 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, 20220009 + 20220010.

It is an arithmetic number, because the mean of its divisors is an integer number (20220010).

Almost surely, 2^40440019 is an apocalyptic number.

40440019 is a deficient number, since it is larger than the sum of its proper divisors (1).

40440019 is an equidigital number, since it uses as much as digits as its factorization.

40440019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 40440019 is about 6359.2467321217. The cubic root of 40440019 is about 343.2446554107.

The spelling of 40440019 in words is "forty million, four hundred forty thousand, nineteen".