2621345 has 4 divisors (see below), whose sum is σ = 3145620. Its totient is φ = 2097072.

The previous prime is 2621309. The next prime is 2621347. The reversal of 2621345 is 5431262.

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 1183744 + 1437601 = 1088^2 + 1199^2 .

It is a cyclic number.

It is not a de Polignac number, because 2621345 - 2¹⁶ = 2555809 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2621345.

It is not an unprimeable number, because it can be changed into a prime (2621347) 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, 262130 + ... + 262139.

It is an arithmetic number, because the mean of its divisors is an integer number (786405).

2^2621345 is an apocalyptic number.

It is an amenable number.

2621345 is a deficient number, since it is larger than the sum of its proper divisors (524275).

2621345 is an equidigital number, since it uses as much as digits as its factorization.

2621345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 524274.

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

The square root of 2621345 is about 1619.0568242035. The cubic root of 2621345 is about 137.8821545227.

The spelling of 2621345 in words is "two million, six hundred twenty-one thousand, three hundred forty-five".