1841818421 has 4 divisors (see below), whose sum is σ = 1862513100. Its totient is φ = 1821123744.

The previous prime is 1841818411. The next prime is 1841818427. The reversal of 1841818421 is 1248181481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1248181481 = 641 ⋅1947241.

It can be written as a sum of positive squares in 2 ways, for example, as 369177796 + 1472640625 = 19214^2 + 38375^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1841818421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1841818427) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10347206 + ... + 10347383.

It is an arithmetic number, because the mean of its divisors is an integer number (465628275).

Almost surely, 2^1841818421 is an apocalyptic number.

It is an amenable number.

1841818421 is a deficient number, since it is larger than the sum of its proper divisors (20694679).

1841818421 is an equidigital number, since it uses as much as digits as its factorization.

1841818421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20694678.

The product of its digits is 16384, while the sum is 38.

The square root of 1841818421 is about 42916.4120238400. The cubic root of 1841818421 is about 1225.7886735277.

The spelling of 1841818421 in words is "one billion, eight hundred forty-one million, eight hundred eighteen thousand, four hundred twenty-one".