16897220 has 12 divisors (see below), whose sum is σ = 35484204. Its totient is φ = 6758880.

The previous prime is 16897211. The next prime is 16897241. The reversal of 16897220 is 2279861.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10982596 + 5914624 = 3314^2 + 2432^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 422411 + ... + 422450.

It is an arithmetic number, because the mean of its divisors is an integer number (2957017).

Almost surely, 2^16897220 is an apocalyptic number.

16897220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16897220 is an abundant number, since it is smaller than the sum of its proper divisors (18586984).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16897220 is a wasteful number, since it uses less digits than its factorization.

16897220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844870 (or 844868 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 16897220 is about 4110.6228238553. The cubic root of 16897220 is about 256.6089223746.

The spelling of 16897220 in words is "sixteen million, eight hundred ninety-seven thousand, two hundred twenty".