1201819 has 4 divisors (see below), whose sum is σ = 1254096. Its totient is φ = 1149544.

The previous prime is 1201813. The next prime is 1201829. The reversal of 1201819 is 9181021.

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

It is a cyclic number.

It is not a de Polignac number, because 1201819 - 2⁵ = 1201787 is a prime.

It is a super-2 number, since 2×1201819² = 2888737817522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

1201819 is a lucky number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 1201819.

It is not an unprimeable number, because it can be changed into a prime (1201813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26104 + ... + 26149.

It is an arithmetic number, because the mean of its divisors is an integer number (313524).

2^1201819 is an apocalyptic number.

1201819 is a deficient number, since it is larger than the sum of its proper divisors (52277).

1201819 is an equidigital number, since it uses as much as digits as its factorization.

1201819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52276.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1201819 is about 1096.2750567262. The cubic root of 1201819 is about 106.3195235869.

The spelling of 1201819 in words is "one million, two hundred one thousand, eight hundred nineteen".