16406945 has 16 divisors (see below), whose sum is σ = 20291472. Its totient is φ = 12729600.

The previous prime is 16406941. The next prime is 16406959. The reversal of 16406945 is 54960461.

It can be written as a sum of positive squares in 8 ways, for example, as 12544 + 16394401 = 112^2 + 4049^2 .

It is not a de Polignac number, because 16406945 - 2² = 16406941 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16406941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26459 + ... + 27071.

It is an arithmetic number, because the mean of its divisors is an integer number (1268217).

Almost surely, 2^16406945 is an apocalyptic number.

It is an amenable number.

16406945 is a deficient number, since it is larger than the sum of its proper divisors (3884527).

16406945 is a wasteful number, since it uses less digits than its factorization.

16406945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 772.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 16406945 is about 4050.5487282589. The cubic root of 16406945 is about 254.1026771935.

The spelling of 16406945 in words is "sixteen million, four hundred six thousand, nine hundred forty-five".