3105945 has 20 divisors (see below), whose sum is σ = 5568420. Its totient is φ = 1656288.

The previous prime is 3105941. The next prime is 3105961. The reversal of 3105945 is 5495013.

It can be written as a sum of positive squares in 2 ways, for example, as 2178576 + 927369 = 1476^2 + 963^2 .

It is not a de Polignac number, because 3105945 - 2² = 3105941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

3105945 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3105941) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3430 + ... + 4239.

It is an arithmetic number, because the mean of its divisors is an integer number (278421).

Almost surely, 2^3105945 is an apocalyptic number.

It is an amenable number.

3105945 is a deficient number, since it is larger than the sum of its proper divisors (2462475).

3105945 is an equidigital number, since it uses as much as digits as its factorization.

3105945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7686 (or 7677 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 3105945 is about 1762.3691440785. The cubic root of 3105945 is about 145.9031226964.

The spelling of 3105945 in words is "three million, one hundred five thousand, nine hundred forty-five".