1840738945 has 4 divisors (see below), whose sum is σ = 2208886740. Its totient is φ = 1472591152.

The previous prime is 1840738909. The next prime is 1840739003. The reversal of 1840738945 is 5498370481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5498370481 = 61 ⋅90137221.

It can be written as a sum of positive squares in 2 ways, for example, as 1109955856 + 730783089 = 33316^2 + 27033^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840738945 - 2¹⁵ = 1840706177 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 184073890 + ... + 184073899.

It is an arithmetic number, because the mean of its divisors is an integer number (552221685).

Almost surely, 2^1840738945 is an apocalyptic number.

It is an amenable number.

1840738945 is a deficient number, since it is larger than the sum of its proper divisors (368147795).

1840738945 is an equidigital number, since it uses as much as digits as its factorization.

1840738945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368147794.

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 1840738945 is about 42903.8336865134. The cubic root of 1840738945 is about 1225.5491515367.

The spelling of 1840738945 in words is "one billion, eight hundred forty million, seven hundred thirty-eight thousand, nine hundred forty-five".