2040405 has 8 divisors (see below), whose sum is σ = 3264672. Its totient is φ = 1088208.

The previous prime is 2040403. The next prime is 2040407. The reversal of 2040405 is 5040402.

It is an interprime number because it is at equal distance from previous prime (2040403) and next prime (2040407).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2040405 - 2¹ = 2040403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 136027 = 2040405 / (2 + 0 + 4 + 0 + 4 + 0 + 5).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2040403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67999 + ... + 68028.

It is an arithmetic number, because the mean of its divisors is an integer number (408084).

2^2040405 is an apocalyptic number.

It is an amenable number.

2040405 is a deficient number, since it is larger than the sum of its proper divisors (1224267).

2040405 is a wasteful number, since it uses less digits than its factorization.

2040405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136035.

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 2040405 is about 1428.4274570310. The cubic root of 2040405 is about 126.8349064834.

Adding to 2040405 its reverse (5040402), we get a palindrome (7080807).

The spelling of 2040405 in words is "two million, forty thousand, four hundred five".