2123465 has 4 divisors (see below), whose sum is σ = 2548164. Its totient is φ = 1698768.

The previous prime is 2123461. The next prime is 2123479. The reversal of 2123465 is 5643212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1478656 + 644809 = 1216^2 + 803^2 .

It is a cyclic number.

It is not a de Polignac number, because 2123465 - 2² = 2123461 is a prime.

It is a d-powerful number, because it can be written as 2¹⁵ + 1 + 2¹⁷ + 3⁷ + 4⁶ + 6³ + 5⁹ .

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 2123465.

It is not an unprimeable number, because it can be changed into a prime (2123461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 212342 + ... + 212351.

It is an arithmetic number, because the mean of its divisors is an integer number (637041).

2^2123465 is an apocalyptic number.

It is an amenable number.

2123465 is a deficient number, since it is larger than the sum of its proper divisors (424699).

2123465 is an equidigital number, since it uses as much as digits as its factorization.

2123465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424698.

The product of its digits is 1440, while the sum is 23.

The square root of 2123465 is about 1457.2113779408. The cubic root of 2123465 is about 128.5331158625.

Adding to 2123465 its reverse (5643212), we get a palindrome (7766677).

The spelling of 2123465 in words is "two million, one hundred twenty-three thousand, four hundred sixty-five".