16890305 has 8 divisors (see below), whose sum is σ = 20651112. Its totient is φ = 13257088.

The previous prime is 16890287. The next prime is 16890311. The reversal of 16890305 is 50309861.

It can be written as a sum of positive squares in 4 ways, for example, as 55696 + 16834609 = 236^2 + 4103^2 .

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 16890305 - 2¹⁴ = 16873921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31604 + ... + 32133.

It is an arithmetic number, because the mean of its divisors is an integer number (2581389).

Almost surely, 2^16890305 is an apocalyptic number.

It is an amenable number.

16890305 is a deficient number, since it is larger than the sum of its proper divisors (3760807).

16890305 is an equidigital number, since it uses as much as digits as its factorization.

16890305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63795.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 16890305 is about 4109.7816243689. The cubic root of 16890305 is about 256.5739128126.

The spelling of 16890305 in words is "sixteen million, eight hundred ninety thousand, three hundred five".