16000409 has 2 divisors, whose sum is σ = 16000410. Its totient is φ = 16000408.

The previous prime is 16000403. The next prime is 16000447. The reversal of 16000409 is 90400061.

16000409 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14462809 + 1537600 = 3803^2 + 1240^2 .

It is a cyclic number.

It is not a de Polignac number, because 16000409 - 2⁴ = 16000393 is a prime.

It is not a weakly prime, because it can be changed into another prime (16000403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8000204 + 8000205.

It is an arithmetic number, because the mean of its divisors is an integer number (8000205).

Almost surely, 2^16000409 is an apocalyptic number.

It is an amenable number.

16000409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16000409 is an equidigital number, since it uses as much as digits as its factorization.

16000409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 16000409 is about 4000.0511246733. The cubic root of 16000409 is about 251.9863570761.

The spelling of 16000409 in words is "sixteen million, four hundred nine", and thus it is an aban number.