1813420045 has 8 divisors (see below), whose sum is σ = 2195362296. Its totient is φ = 1437897216.

The previous prime is 1813420043. The next prime is 1813420079. The reversal of 1813420045 is 5400243181.

It can be written as a sum of positive squares in 4 ways, for example, as 215179561 + 1598240484 = 14669^2 + 39978^2 .

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 1813420045 - 2¹ = 1813420043 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1813419995 and 1813420022.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1813420043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1604232 + ... + 1605361.

It is an arithmetic number, because the mean of its divisors is an integer number (274420287).

Almost surely, 2^1813420045 is an apocalyptic number.

It is an amenable number.

1813420045 is a deficient number, since it is larger than the sum of its proper divisors (381942251).

1813420045 is a wasteful number, since it uses less digits than its factorization.

1813420045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3209711.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 1813420045 is about 42584.2699244686. The cubic root of 1813420045 is about 1219.4560069118.

The spelling of 1813420045 in words is "one billion, eight hundred thirteen million, four hundred twenty thousand, forty-five".