2145172 has 6 divisors (see below), whose sum is σ = 3754058. Its totient is φ = 1072584.

The previous prime is 2145163. The next prime is 2145173. The reversal of 2145172 is 2715412.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1449616 + 695556 = 1204^2 + 834^2 .

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268143 + ... + 268150.

2^2145172 is an apocalyptic number.

It is an amenable number.

2145172 is a deficient number, since it is larger than the sum of its proper divisors (1608886).

2145172 is a wasteful number, since it uses less digits than its factorization.

2145172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 536297 (or 536295 counting only the distinct ones).

The product of its digits is 560, while the sum is 22.

The square root of 2145172 is about 1464.6405702424. The cubic root of 2145172 is about 128.9696060437.

The spelling of 2145172 in words is "two million, one hundred forty-five thousand, one hundred seventy-two".