404445619 has 2 divisors, whose sum is σ = 404445620. Its totient is φ = 404445618.

The previous prime is 404445617. The next prime is 404445641. The reversal of 404445619 is 916544404.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 404445619 - 2¹ = 404445617 is a prime.

It is a super-2 number, since 2×404445619² = 327152517456586322, which contains 22 as substring.

Together with 404445617, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (404445611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202222809 + 202222810.

It is an arithmetic number, because the mean of its divisors is an integer number (202222810).

Almost surely, 2^404445619 is an apocalyptic number.

404445619 is a deficient number, since it is larger than the sum of its proper divisors (1).

404445619 is an equidigital number, since it uses as much as digits as its factorization.

404445619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69120, while the sum is 37.

The square root of 404445619 is about 20110.8333740798. The cubic root of 404445619 is about 739.5258826874.

It can be divided in two parts, 4044 and 45619, that multiplied together give a triangular number (184483236 = T₁₉₂₀₈).

The spelling of 404445619 in words is "four hundred four million, four hundred forty-five thousand, six hundred nineteen".