1820688245 has 16 divisors (see below), whose sum is σ = 2195424000. Its totient is φ = 1449504768.

The previous prime is 1820688227. The next prime is 1820688269. The reversal of 1820688245 is 5428860281.

It is a cyclic number.

It is not a de Polignac number, because 1820688245 - 2⁸ = 1820687989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1820688196 and 1820688205.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1379696 + ... + 1381014.

It is an arithmetic number, because the mean of its divisors is an integer number (137214000).

Almost surely, 2^1820688245 is an apocalyptic number.

It is an amenable number.

1820688245 is a deficient number, since it is larger than the sum of its proper divisors (374735755).

1820688245 is a wasteful number, since it uses less digits than its factorization.

1820688245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2452.

The product of its (nonzero) digits is 245760, while the sum is 44.

The square root of 1820688245 is about 42669.5236087773. The cubic root of 1820688245 is about 1221.0830311540.

The spelling of 1820688245 in words is "one billion, eight hundred twenty million, six hundred eighty-eight thousand, two hundred forty-five".