2620405 has 4 divisors (see below), whose sum is σ = 3144492. Its totient is φ = 2096320.

The previous prime is 2620403. The next prime is 2620417. The reversal of 2620405 is 5040262.

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 432964 + 2187441 = 658^2 + 1479^2 .

It is not a de Polignac number, because 2620405 - 2¹ = 2620403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262036 + ... + 262045.

It is an arithmetic number, because the mean of its divisors is an integer number (786123).

2^2620405 is an apocalyptic number.

It is an amenable number.

2620405 is a deficient number, since it is larger than the sum of its proper divisors (524087).

2620405 is an equidigital number, since it uses as much as digits as its factorization.

2620405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524086.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 2620405 is about 1618.7665057074. The cubic root of 2620405 is about 137.8656712897.

Adding to 2620405 its reverse (5040262), we get a palindrome (7660667).

It can be divided in two parts, 2620 and 405, that added together give a square (3025 = 55²).

The spelling of 2620405 in words is "two million, six hundred twenty thousand, four hundred five".