1845406243 has 4 divisors (see below), whose sum is σ = 1846885000. Its totient is φ = 1843927488.

The previous prime is 1845406237. The next prime is 1845406247. The reversal of 1845406243 is 3426045481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3426045481 = 13513 ⋅253537.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1845406243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1845406247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737505 + ... + 740002.

It is an arithmetic number, because the mean of its divisors is an integer number (461721250).

Almost surely, 2^1845406243 is an apocalyptic number.

1845406243 is a deficient number, since it is larger than the sum of its proper divisors (1478757).

1845406243 is a wasteful number, since it uses less digits than its factorization.

1845406243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1478756.

The product of its (nonzero) digits is 92160, while the sum is 37.

The square root of 1845406243 is about 42958.1918031940. The cubic root of 1845406243 is about 1226.5840937726.

The spelling of 1845406243 in words is "one billion, eight hundred forty-five million, four hundred six thousand, two hundred forty-three".