16555399 has 8 divisors (see below), whose sum is σ = 20033568. Its totient is φ = 13355520.

The previous prime is 16555397. The next prime is 16555411. The reversal of 16555399 is 99355561.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16555399 - 2¹ = 16555397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16555393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69442 + ... + 69679.

It is an arithmetic number, because the mean of its divisors is an integer number (2504196).

Almost surely, 2^16555399 is an apocalyptic number.

16555399 is a deficient number, since it is larger than the sum of its proper divisors (3478169).

16555399 is a wasteful number, since it uses less digits than its factorization.

16555399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139145.

The product of its digits is 182250, while the sum is 43.

The square root of 16555399 is about 4068.8326335695. The cubic root of 16555399 is about 254.8667713634.

The spelling of 16555399 in words is "sixteen million, five hundred fifty-five thousand, three hundred ninety-nine".