1800172 has 24 divisors (see below), whose sum is σ = 3471552. Its totient is φ = 810000.

The previous prime is 1800167. The next prime is 1800179. The reversal of 1800172 is 2710081.

It is not an unprimeable number, because it can be changed into a prime (1800179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7047 + ... + 7297.

It is an arithmetic number, because the mean of its divisors is an integer number (144648).

2^1800172 is an apocalyptic number.

It is an amenable number.

1800172 is a deficient number, since it is larger than the sum of its proper divisors (1671380).

1800172 is a wasteful number, since it uses less digits than its factorization.

1800172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429 (or 427 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1800172 is about 1341.7048855840. The cubic root of 1800172 is about 121.6479143760.

Subtracting 1800172 from its reverse (2710081), we obtain a palindrome (909909).

The spelling of 1800172 in words is "one million, eight hundred thousand, one hundred seventy-two".