1838227645 has 4 divisors (see below), whose sum is σ = 2205873180. Its totient is φ = 1470582112.

The previous prime is 1838227621. The next prime is 1838227649. The reversal of 1838227645 is 5467228381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 817616836 + 1020610809 = 28594^2 + 31947^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1838227645 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1838227595 and 1838227604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1838227649) 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, 183822760 + ... + 183822769.

It is an arithmetic number, because the mean of its divisors is an integer number (551468295).

Almost surely, 2^1838227645 is an apocalyptic number.

It is an amenable number.

1838227645 is a deficient number, since it is larger than the sum of its proper divisors (367645535).

1838227645 is an equidigital number, since it uses as much as digits as its factorization.

1838227645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367645534.

The product of its digits is 645120, while the sum is 46.

The square root of 1838227645 is about 42874.5570822603. The cubic root of 1838227645 is about 1224.9915634571.

The spelling of 1838227645 in words is "one billion, eight hundred thirty-eight million, two hundred twenty-seven thousand, six hundred forty-five".