16409819 has 4 divisors (see below), whose sum is σ = 16939200. Its totient is φ = 15880440.

The previous prime is 16409779. The next prime is 16409831. The reversal of 16409819 is 91890461.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16409819 - 2¹² = 16405723 is a prime.

It is a super-2 number, since 2×16409819² = 538564319225522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16409839) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264644 + ... + 264705.

It is an arithmetic number, because the mean of its divisors is an integer number (4234800).

Almost surely, 2^16409819 is an apocalyptic number.

16409819 is a deficient number, since it is larger than the sum of its proper divisors (529381).

16409819 is an equidigital number, since it uses as much as digits as its factorization.

16409819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529380.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 16409819 is about 4050.9034794722. The cubic root of 16409819 is about 254.1175133591.

The spelling of 16409819 in words is "sixteen million, four hundred nine thousand, eight hundred nineteen".