16172003 has 4 divisors (see below), whose sum is σ = 16320480. Its totient is φ = 16023528.

The previous prime is 16171973. The next prime is 16172017. The reversal of 16172003 is 30027161.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30027161 = 439 ⋅68399.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16172003 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16172033) 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, 74075 + ... + 74292.

It is an arithmetic number, because the mean of its divisors is an integer number (4080120).

Almost surely, 2^16172003 is an apocalyptic number.

16172003 is a deficient number, since it is larger than the sum of its proper divisors (148477).

16172003 is a wasteful number, since it uses less digits than its factorization.

16172003 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148476.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 16172003 is about 4021.4429002536. The cubic root of 16172003 is about 252.8839526740.

Adding to 16172003 its reverse (30027161), we get a palindrome (46199164).

The spelling of 16172003 in words is "sixteen million, one hundred seventy-two thousand, three".