16638125 has 20 divisors (see below), whose sum is σ = 23767392. Its totient is φ = 11406000.

The previous prime is 16638113. The next prime is 16638137. The reversal of 16638125 is 52183661.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (16638113) and next prime (16638137).

It is not a de Polignac number, because 16638125 - 2⁴ = 16638109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16638091 and 16638100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2474 + ... + 6276.

Almost surely, 2^16638125 is an apocalyptic number.

It is an amenable number.

16638125 is a deficient number, since it is larger than the sum of its proper divisors (7129267).

16638125 is an frugal number, since it uses more digits than its factorization.

16638125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3830 (or 3815 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 16638125 is about 4078.9857808039. The cubic root of 16638125 is about 255.2905824952.

The spelling of 16638125 in words is "sixteen million, six hundred thirty-eight thousand, one hundred twenty-five".