16403138 has 8 divisors (see below), whose sum is σ = 24678732. Its totient is φ = 8176896.

The previous prime is 16403131. The next prime is 16403143. The reversal of 16403138 is 83130461.

16403138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 15264649 + 1138489 = 3907^2 + 1067^2 .

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

It is not an unprimeable number, because it can be changed into a prime (16403131) 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, 11495 + ... + 12842.

Almost surely, 2^16403138 is an apocalyptic number.

16403138 is a deficient number, since it is larger than the sum of its proper divisors (8275594).

16403138 is a wasteful number, since it uses less digits than its factorization.

16403138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24676.

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 16403138 is about 4050.0787646662. The cubic root of 16403138 is about 254.0830220267.

Adding to 16403138 its reverse (83130461), we get a palindrome (99533599).

The spelling of 16403138 in words is "sixteen million, four hundred three thousand, one hundred thirty-eight".