16305138 has 20 divisors (see below), whose sum is σ = 36535950. Its totient is φ = 5434992.

The previous prime is 16305119. The next prime is 16305151. The reversal of 16305138 is 83150361.

It can be written as a sum of positive squares in only one way, i.e., 12131289 + 4173849 = 3483^2 + 2043^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 50163 + ... + 50486.

Almost surely, 2^16305138 is an apocalyptic number.

16305138 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16305138 is an abundant number, since it is smaller than the sum of its proper divisors (20230812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16305138 is a wasteful number, since it uses less digits than its factorization.

16305138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100663 (or 100654 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 27.

The square root of 16305138 is about 4037.9621097777. The cubic root of 16305138 is about 253.5760074593.

Adding to 16305138 its reverse (83150361), we get a palindrome (99455499).

The spelling of 16305138 in words is "sixteen million, three hundred five thousand, one hundred thirty-eight".