2128145 has 8 divisors (see below), whose sum is σ = 2704104. Its totient is φ = 1602304.

The previous prime is 2128103. The next prime is 2128153. The reversal of 2128145 is 5418212.

It can be written as a sum of positive squares in 4 ways, for example, as 430336 + 1697809 = 656^2 + 1303^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2128145 - 2¹² = 2124049 is a prime.

It is a super-2 number, since 2×2128145² = 9058002282050, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2128145.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12434 + ... + 12603.

It is an arithmetic number, because the mean of its divisors is an integer number (338013).

2^2128145 is an apocalyptic number.

It is an amenable number.

2128145 is a deficient number, since it is larger than the sum of its proper divisors (575959).

2128145 is a wasteful number, since it uses less digits than its factorization.

2128145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25059.

The product of its digits is 640, while the sum is 23.

The square root of 2128145 is about 1458.8163009783. The cubic root of 2128145 is about 128.6274732149.

The spelling of 2128145 in words is "two million, one hundred twenty-eight thousand, one hundred forty-five".