43404019 has 2 divisors, whose sum is σ = 43404020. Its totient is φ = 43404018.

The previous prime is 43404017. The next prime is 43404029. The reversal of 43404019 is 91040434.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43404019 - 2¹ = 43404017 is a prime.

It is a super-2 number, since 2×43404019² = 3767817730704722, which contains 22 as substring.

Together with 43404017, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 43403984 and 43404002.

It is not a weakly prime, because it can be changed into another prime (43404017) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21702009 + 21702010.

It is an arithmetic number, because the mean of its divisors is an integer number (21702010).

Almost surely, 2^43404019 is an apocalyptic number.

43404019 is a deficient number, since it is larger than the sum of its proper divisors (1).

43404019 is an equidigital number, since it uses as much as digits as its factorization.

43404019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 43404019 is about 6588.1726601540. The cubic root of 43404019 is about 351.4336272167.

The spelling of 43404019 in words is "forty-three million, four hundred four thousand, nineteen".