2042345 has 4 divisors (see below), whose sum is σ = 2450820. Its totient is φ = 1633872.

The previous prime is 2042323. The next prime is 2042347. The reversal of 2042345 is 5432402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5432402 = 2 ⋅2716201.

It can be written as a sum of positive squares in 2 ways, for example, as 534361 + 1507984 = 731^2 + 1228^2 .

It is a cyclic number.

It is not a de Polignac number, because 2042345 - 2⁶ = 2042281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2042347) 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, 204230 + ... + 204239.

It is an arithmetic number, because the mean of its divisors is an integer number (612705).

2^2042345 is an apocalyptic number.

It is an amenable number.

2042345 is a deficient number, since it is larger than the sum of its proper divisors (408475).

2042345 is an equidigital number, since it uses as much as digits as its factorization.

2042345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408474.

The product of its (nonzero) digits is 960, while the sum is 20.

The square root of 2042345 is about 1429.1063641311. The cubic root of 2042345 is about 126.8750916061.

Adding to 2042345 its reverse (5432402), we get a palindrome (7474747).

The spelling of 2042345 in words is "two million, forty-two thousand, three hundred forty-five".