16409555 has 4 divisors (see below), whose sum is σ = 19691472. Its totient is φ = 13127640.

The previous prime is 16409551. The next prime is 16409567. The reversal of 16409555 is 55590461.

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

It is not a de Polignac number, because 16409555 - 2² = 16409551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16409551) 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, 1640951 + ... + 1640960.

It is an arithmetic number, because the mean of its divisors is an integer number (4922868).

Almost surely, 2^16409555 is an apocalyptic number.

16409555 is a deficient number, since it is larger than the sum of its proper divisors (3281917).

16409555 is an equidigital number, since it uses as much as digits as its factorization.

16409555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3281916.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 16409555 is about 4050.8708940177. The cubic root of 16409555 is about 254.1161506103.

The spelling of 16409555 in words is "sixteen million, four hundred nine thousand, five hundred fifty-five".