2621725 has 6 divisors (see below), whose sum is σ = 3250970. Its totient is φ = 2097360.

The previous prime is 2621699. The next prime is 2621737. The reversal of 2621725 is 5271262.

It can be written as a sum of positive squares in 3 ways, for example, as 68121 + 2553604 = 261^2 + 1598^2 .

It is not a de Polignac number, because 2621725 - 2⁵ = 2621693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 104869 = 2621725 / (2 + 6 + 2 + 1 + 7 + 2 + 5).

2621725 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2621725.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52410 + ... + 52459.

2^2621725 is an apocalyptic number.

2621725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

2621725 is a deficient number, since it is larger than the sum of its proper divisors (629245).

2621725 is a wasteful number, since it uses less digits than its factorization.

2621725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104879 (or 104874 counting only the distinct ones).

The product of its digits is 1680, while the sum is 25.

The square root of 2621725 is about 1619.1741722248. The cubic root of 2621725 is about 137.8888168388. Note that the first 4 decimals are identical.

Adding to 2621725 its reverse (5271262), we get a palindrome (7892987).

The spelling of 2621725 in words is "two million, six hundred twenty-one thousand, seven hundred twenty-five".