16398605 has 6 divisors (see below), whose sum is σ = 19689198. Its totient is φ = 13111640.

The previous prime is 16398593. The next prime is 16398607. The reversal of 16398605 is 50689361.

It can be written as a sum of positive squares in only one way, i.e., 13118884 + 3279721 = 3622^2 + 1811^2 .

It is not a de Polignac number, because 16398605 - 2⁴ = 16398589 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16398607) 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 5 ways as a sum of consecutive naturals, for example, 8150 + ... + 9960.

It is an arithmetic number, because the mean of its divisors is an integer number (3281533).

Almost surely, 2^16398605 is an apocalyptic number.

It is an amenable number.

16398605 is a deficient number, since it is larger than the sum of its proper divisors (3290593).

16398605 is an frugal number, since it uses more digits than its factorization.

16398605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3627 (or 1816 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 16398605 is about 4049.5191072521. The cubic root of 16398605 is about 254.0596146264.

The spelling of 16398605 in words is "sixteen million, three hundred ninety-eight thousand, six hundred five".