16338681 has 12 divisors (see below), whose sum is σ = 24046308. Its totient is φ = 10686624.

The previous prime is 16338607. The next prime is 16338703. The reversal of 16338681 is 18683361.

It can be written as a sum of positive squares in 2 ways, for example, as 7338681 + 9000000 = 2709^2 + 3000^2 .

It is not a de Polignac number, because 16338681 - 2¹⁴ = 16322297 is a prime.

It is a super-2 number, since 2×16338681² = 533904993639522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16338181) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 16650 + ... + 17603.

It is an arithmetic number, because the mean of its divisors is an integer number (2003859).

Almost surely, 2^16338681 is an apocalyptic number.

It is an amenable number.

16338681 is a deficient number, since it is larger than the sum of its proper divisors (7707627).

16338681 is a wasteful number, since it uses less digits than its factorization.

16338681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34312 (or 34309 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 16338681 is about 4042.1134323519. The cubic root of 16338681 is about 253.7497742401.

The spelling of 16338681 in words is "sixteen million, three hundred thirty-eight thousand, six hundred eighty-one".