1845309973 has 4 divisors (see below), whose sum is σ = 1987256908. Its totient is φ = 1703363040.

The previous prime is 1845309959. The next prime is 1845309979. The reversal of 1845309973 is 3799035481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3799035481 = 1879 ⋅2021839.

It can be written as a sum of positive squares in 2 ways, for example, as 73994404 + 1771315569 = 8602^2 + 42087^2 .

It is a cyclic number.

It is not a de Polignac number, because 1845309973 - 2⁹ = 1845309461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1845309979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70973448 + ... + 70973473.

It is an arithmetic number, because the mean of its divisors is an integer number (496814227).

Almost surely, 2^1845309973 is an apocalyptic number.

1845309973 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1845309973 is a deficient number, since it is larger than the sum of its proper divisors (141946935).

1845309973 is a wasteful number, since it uses less digits than its factorization.

1845309973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141946934.

The product of its (nonzero) digits is 816480, while the sum is 49.

The square root of 1845309973 is about 42957.0712805238. The cubic root of 1845309973 is about 1226.5627641774.

The spelling of 1845309973 in words is "one billion, eight hundred forty-five million, three hundred nine thousand, nine hundred seventy-three".