1820345013 has 6 divisors (see below), whose sum is σ = 2629387254. Its totient is φ = 1213563336.

The previous prime is 1820344991. The next prime is 1820345039. The reversal of 1820345013 is 3105430281.

It is a happy number.

1820345013 is a `hidden beast` number, since 1 + 8 + 203 + 450 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1820131569 + 213444 = 42663^2 + 462^2 .

It is not a de Polignac number, because 1820345013 - 2⁶ = 1820344949 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820345053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 101130270 + ... + 101130287.

It is an arithmetic number, because the mean of its divisors is an integer number (438231209).

Almost surely, 2^1820345013 is an apocalyptic number.

It is an amenable number.

1820345013 is a deficient number, since it is larger than the sum of its proper divisors (809042241).

1820345013 is a wasteful number, since it uses less digits than its factorization.

1820345013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 202260563 (or 202260560 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 1820345013 is about 42665.5014385159. The cubic root of 1820345013 is about 1221.0062944014.

Adding to 1820345013 its reverse (3105430281), we get a palindrome (4925775294).

The spelling of 1820345013 in words is "one billion, eight hundred twenty million, three hundred forty-five thousand, thirteen".