2725861 has 4 divisors (see below), whose sum is σ = 2813824. Its totient is φ = 2637900.

The previous prime is 2725847. The next prime is 2725871. The reversal of 2725861 is 1685272.

2725861 = 16² + 17² + ... + 201².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2725861 - 2⁵ = 2725829 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 87931 = 2725861 / (2 + 7 + 2 + 5 + 8 + 6 + 1).

It is a d-powerful number, because it can be written as 2¹³ + 7⁵ + 2¹⁹ + 5⁷ + 8⁷ + 6⁴ + 1 .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2725841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43935 + ... + 43996.

It is an arithmetic number, because the mean of its divisors is an integer number (703456).

2^2725861 is an apocalyptic number.

It is an amenable number.

2725861 is a deficient number, since it is larger than the sum of its proper divisors (87963).

2725861 is an equidigital number, since it uses as much as digits as its factorization.

2725861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87962.

The product of its digits is 6720, while the sum is 31.

The square root of 2725861 is about 1651.0181707056. The cubic root of 2725861 is about 139.6908313562.

The spelling of 2725861 in words is "two million, seven hundred twenty-five thousand, eight hundred sixty-one".