16909945 has 16 divisors (see below), whose sum is σ = 22804992. Its totient is φ = 11943360.

The previous prime is 16909927. The next prime is 16909957. The reversal of 16909945 is 54990961.

It is not a de Polignac number, because 16909945 - 2⁷ = 16909817 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4161 + ... + 7150.

It is an arithmetic number, because the mean of its divisors is an integer number (1425312).

Almost surely, 2^16909945 is an apocalyptic number.

It is an amenable number.

16909945 is a deficient number, since it is larger than the sum of its proper divisors (5895047).

16909945 is a wasteful number, since it uses less digits than its factorization.

16909945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11352.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 16909945 is about 4112.1703515297. The cubic root of 16909945 is about 256.6733221040.

The spelling of 16909945 in words is "sixteen million, nine hundred nine thousand, nine hundred forty-five".