1819391945 has 8 divisors (see below), whose sum is σ = 2495166144. Its totient is φ = 1247583024.

The previous prime is 1819391939. The next prime is 1819391983. The reversal of 1819391945 is 5491939181.

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

It is a cyclic number.

It is not a de Polignac number, because 1819391945 - 2¹⁴ = 1819375561 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1819391893 and 1819391902.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25991279 + ... + 25991348.

It is an arithmetic number, because the mean of its divisors is an integer number (311895768).

Almost surely, 2^1819391945 is an apocalyptic number.

It is an amenable number.

1819391945 is a deficient number, since it is larger than the sum of its proper divisors (675774199).

1819391945 is an equidigital number, since it uses as much as digits as its factorization.

1819391945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51982639.

The product of its digits is 349920, while the sum is 50.

The square root of 1819391945 is about 42654.3309055481. The cubic root of 1819391945 is about 1220.7931653574.

The spelling of 1819391945 in words is "one billion, eight hundred nineteen million, three hundred ninety-one thousand, nine hundred forty-five".