405109919 has 2 divisors, whose sum is σ = 405109920. Its totient is φ = 405109918.

The previous prime is 405109853. The next prime is 405109921. The reversal of 405109919 is 919901504.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 405109919 - 2¹² = 405105823 is a prime.

It is a super-2 number, since 2×405109919² = 328228092944373122, which contains 22 as substring.

Together with 405109921, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (405109619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202554959 + 202554960.

It is an arithmetic number, because the mean of its divisors is an integer number (202554960).

Almost surely, 2^405109919 is an apocalyptic number.

405109919 is a deficient number, since it is larger than the sum of its proper divisors (1).

405109919 is an equidigital number, since it uses as much as digits as its factorization.

405109919 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 38.

The square root of 405109919 is about 20127.3425717356. The cubic root of 405109919 is about 739.9305504582.

The spelling of 405109919 in words is "four hundred five million, one hundred nine thousand, nine hundred nineteen".