1801172 has 6 divisors (see below), whose sum is σ = 3152058. Its totient is φ = 900584.

The previous prime is 1801117. The next prime is 1801187. The reversal of 1801172 is 2711081.

It can be written as a sum of positive squares in only one way, i.e., 1674436 + 126736 = 1294^2 + 356^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 225143 + ... + 225150.

It is an arithmetic number, because the mean of its divisors is an integer number (525343).

2^1801172 is an apocalyptic number.

It is an amenable number.

1801172 is a deficient number, since it is larger than the sum of its proper divisors (1350886).

1801172 is a wasteful number, since it uses less digits than its factorization.

1801172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450297 (or 450295 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 20.

The square root of 1801172 is about 1342.0774940368. The cubic root of 1801172 is about 121.6704354455.

Subtracting 1801172 from its reverse (2711081), we obtain a palindrome (909909).

The spelling of 1801172 in words is "one million, eight hundred one thousand, one hundred seventy-two".