16357409 has 2 divisors, whose sum is σ = 16357410. Its totient is φ = 16357408.

The previous prime is 16357387. The next prime is 16357459. The reversal of 16357409 is 90475361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13667809 + 2689600 = 3697^2 + 1640^2 .

It is a cyclic number.

It is not a de Polignac number, because 16357409 - 2⁸ = 16357153 is a prime.

It is a nialpdrome in base 16.

It is not a weakly prime, because it can be changed into another prime (16357459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8178704 + 8178705.

It is an arithmetic number, because the mean of its divisors is an integer number (8178705).

Almost surely, 2^16357409 is an apocalyptic number.

It is an amenable number.

16357409 is a deficient number, since it is larger than the sum of its proper divisors (1).

16357409 is an equidigital number, since it uses as much as digits as its factorization.

16357409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 16357409 is about 4044.4293787876. The cubic root of 16357409 is about 253.8466896765.

The spelling of 16357409 in words is "sixteen million, three hundred fifty-seven thousand, four hundred nine".