2730805 has 32 divisors (see below), whose sum is σ = 4209408. Its totient is φ = 1651200.

The previous prime is 2730803. The next prime is 2730811. The reversal of 2730805 is 5080372.

2730805 = T₁₀₆ + T₁₀₇ + ... + T₂₅₉.

It is not a de Polignac number, because 2730805 - 2¹ = 2730803 is a prime.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2730805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2730803) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15699 + ... + 15871.

It is an arithmetic number, because the mean of its divisors is an integer number (131544).

2^2730805 is an apocalyptic number.

It is an amenable number.

2730805 is a deficient number, since it is larger than the sum of its proper divisors (1478603).

2730805 is a wasteful number, since it uses less digits than its factorization.

2730805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237.

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

The square root of 2730805 is about 1652.5147503124. The cubic root of 2730805 is about 139.7752345777.

The spelling of 2730805 in words is "two million, seven hundred thirty thousand, eight hundred five".