1829363821 has 4 divisors (see below), whose sum is σ = 1836164700. Its totient is φ = 1822562944.

The previous prime is 1829363803. The next prime is 1829363917. The reversal of 1829363821 is 1283639281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1283639281 = 17 ⋅75508193.

It can be written as a sum of positive squares in 2 ways, for example, as 801456100 + 1027907721 = 28310^2 + 32061^2 .

It is a cyclic number.

It is not a de Polignac number, because 1829363821 - 2⁹ = 1829363309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1829363801) 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, 3400036 + ... + 3400573.

It is an arithmetic number, because the mean of its divisors is an integer number (459041175).

Almost surely, 2^1829363821 is an apocalyptic number.

It is an amenable number.

1829363821 is a deficient number, since it is larger than the sum of its proper divisors (6800879).

1829363821 is an equidigital number, since it uses as much as digits as its factorization.

1829363821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6800878.

The product of its digits is 124416, while the sum is 43.

The square root of 1829363821 is about 42771.0628930355. The cubic root of 1829363821 is about 1223.0194448354.

The spelling of 1829363821 in words is "one billion, eight hundred twenty-nine million, three hundred sixty-three thousand, eight hundred twenty-one".