2128465 has 8 divisors (see below), whose sum is σ = 2572200. Its totient is φ = 1690752.

The previous prime is 2128463. The next prime is 2128481. The reversal of 2128465 is 5648212.

It can be written as a sum of positive squares in 4 ways, for example, as 77841 + 2050624 = 279^2 + 1432^2 .

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 2128465 - 2¹ = 2128463 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2128463) 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, 684 + ... + 2173.

It is an arithmetic number, because the mean of its divisors is an integer number (321525).

2^2128465 is an apocalyptic number.

It is an amenable number.

2128465 is a deficient number, since it is larger than the sum of its proper divisors (443735).

2128465 is a wasteful number, since it uses less digits than its factorization.

2128465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3011.

The product of its digits is 3840, while the sum is 28.

The square root of 2128465 is about 1458.9259748185. The cubic root of 2128465 is about 128.6339199449.

The spelling of 2128465 in words is "two million, one hundred twenty-eight thousand, four hundred sixty-five".