16621245 has 12 divisors (see below), whose sum is σ = 28810236. Its totient is φ = 8864640.

The previous prime is 16621229. The next prime is 16621259. The reversal of 16621245 is 54212661.

16621245 is a `hidden beast` number, since 16 + 621 + 24 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2013561 + 14607684 = 1419^2 + 3822^2 .

It is not a de Polignac number, because 16621245 - 2⁴ = 16621229 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 184636 + ... + 184725.

It is an arithmetic number, because the mean of its divisors is an integer number (2400853).

Almost surely, 2^16621245 is an apocalyptic number.

16621245 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16621245 is a deficient number, since it is larger than the sum of its proper divisors (12188991).

16621245 is a wasteful number, since it uses less digits than its factorization.

16621245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369372 (or 369369 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 16621245 is about 4076.9161139273. The cubic root of 16621245 is about 255.2042193349.

The spelling of 16621245 in words is "sixteen million, six hundred twenty-one thousand, two hundred forty-five".