16115138 has 8 divisors (see below), whose sum is σ = 26032188. Its totient is φ = 7437744.

The previous prime is 16115137. The next prime is 16115147. The reversal of 16115138 is 83151161.

It can be written as a sum of positive squares in 2 ways, for example, as 15976009 + 139129 = 3997^2 + 373^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 619813 = 16115138 / (1 + 6 + 1 + 1 + 5 + 1 + 3 + 8).

It is not an unprimeable number, because it can be changed into a prime (16115137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 309881 + ... + 309932.

Almost surely, 2^16115138 is an apocalyptic number.

16115138 is a deficient number, since it is larger than the sum of its proper divisors (9917050).

16115138 is a wasteful number, since it uses less digits than its factorization.

16115138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 619828.

The product of its digits is 720, while the sum is 26.

The square root of 16115138 is about 4014.3664506370. The cubic root of 16115138 is about 252.5872025048.

Adding to 16115138 its reverse (83151161), we get a palindrome (99266299).

The spelling of 16115138 in words is "sixteen million, one hundred fifteen thousand, one hundred thirty-eight".