1802121819 has 8 divisors (see below), whose sum is σ = 2403120912. Its totient is φ = 1201268640.

The previous prime is 1802121809. The next prime is 1802121917. The reversal of 1802121819 is 9181212081.

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

It is not a de Polignac number, because 1802121819 - 2¹⁶ = 1802056283 is a prime.

It is a super-2 number, since 2×1802121819² = 6495286101031737522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1802121819.

It is not an unprimeable number, because it can be changed into a prime (1802121809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3364 + ... + 60129.

It is an arithmetic number, because the mean of its divisors is an integer number (300390114).

Almost surely, 2^1802121819 is an apocalyptic number.

1802121819 is a deficient number, since it is larger than the sum of its proper divisors (600999093).

1802121819 is an equidigital number, since it uses as much as digits as its factorization.

1802121819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72957.

The product of its (nonzero) digits is 2304, while the sum is 33.

The square root of 1802121819 is about 42451.4053830966. The cubic root of 1802121819 is about 1216.9181866773.

The spelling of 1802121819 in words is "one billion, eight hundred two million, one hundred twenty-one thousand, eight hundred nineteen".