405664019 has 2 divisors, whose sum is σ = 405664020. Its totient is φ = 405664018.

The previous prime is 405663997. The next prime is 405664033. The reversal of 405664019 is 910466504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405664019 - 2¹² = 405659923 is a prime.

It is a super-2 number, since 2×405664019² = 329126592622464722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 405664019.

It is not a weakly prime, because it can be changed into another prime (405664069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202832009 + 202832010.

It is an arithmetic number, because the mean of its divisors is an integer number (202832010).

Almost surely, 2^405664019 is an apocalyptic number.

405664019 is a deficient number, since it is larger than the sum of its proper divisors (1).

405664019 is an equidigital number, since it uses as much as digits as its factorization.

405664019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 405664019 is about 20141.1027255213. The cubic root of 405664019 is about 740.2677500784.

The spelling of 405664019 in words is "four hundred five million, six hundred sixty-four thousand, nineteen".