16378009 has 2 divisors, whose sum is σ = 16378010. Its totient is φ = 16378008.

The previous prime is 16378003. The next prime is 16378039. The reversal of 16378009 is 90087361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9168784 + 7209225 = 3028^2 + 2685^2 .

It is a cyclic number.

It is not a de Polignac number, because 16378009 - 2⁹ = 16377497 is a prime.

It is not a weakly prime, because it can be changed into another prime (16378003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8189004 + 8189005.

It is an arithmetic number, because the mean of its divisors is an integer number (8189005).

Almost surely, 2^16378009 is an apocalyptic number.

It is an amenable number.

16378009 is a deficient number, since it is larger than the sum of its proper divisors (1).

16378009 is an equidigital number, since it uses as much as digits as its factorization.

16378009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 34.

The square root of 16378009 is about 4046.9752902631. The cubic root of 16378009 is about 253.9532071199.

The spelling of 16378009 in words is "sixteen million, three hundred seventy-eight thousand, nine".