2640105 has 24 divisors (see below), whose sum is σ = 4929288. Its totient is φ = 1299456.

The previous prime is 2640067. The next prime is 2640137. The reversal of 2640105 is 5010462.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 168921 + 2471184 = 411^2 + 1572^2 .

It is not a de Polignac number, because 2640105 - 2⁶ = 2640041 is a prime.

It is a super-2 number, since 2×2640105² = 13940308822050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1672 + ... + 2841.

It is an arithmetic number, because the mean of its divisors is an integer number (205387).

2^2640105 is an apocalyptic number.

It is an amenable number.

2640105 is a deficient number, since it is larger than the sum of its proper divisors (2289183).

2640105 is a wasteful number, since it uses less digits than its factorization.

2640105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4537 (or 4534 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2640105 is about 1624.8399921223. The cubic root of 2640105 is about 138.2102968851.

Adding to 2640105 its reverse (5010462), we get a palindrome (7650567).

The spelling of 2640105 in words is "two million, six hundred forty thousand, one hundred five".