16438138 has 8 divisors (see below), whose sum is σ = 25323732. Its totient is φ = 7996896.

The previous prime is 16438063. The next prime is 16438141. The reversal of 16438138 is 83183461.

It can be written as a sum of positive squares in 2 ways, for example, as 15578809 + 859329 = 3947^2 + 927^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-3 number, since 3×16438138³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110995 + ... + 111142.

Almost surely, 2^16438138 is an apocalyptic number.

16438138 is a deficient number, since it is larger than the sum of its proper divisors (8885594).

16438138 is a wasteful number, since it uses less digits than its factorization.

16438138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222176.

The product of its digits is 13824, while the sum is 34.

The square root of 16438138 is about 4054.3973658239. The cubic root of 16438138 is about 254.2636091846.

The spelling of 16438138 in words is "sixteen million, four hundred thirty-eight thousand, one hundred thirty-eight".