1820829 has 4 divisors (see below), whose sum is σ = 2427776. Its totient is φ = 1213884.

The previous prime is 1820821. The next prime is 1820837. The reversal of 1820829 is 9280281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (1820821) and next prime (1820837).

It is not a de Polignac number, because 1820829 - 2³ = 1820821 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1820796 and 1820805.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820821) 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, 303469 + ... + 303474.

It is an arithmetic number, because the mean of its divisors is an integer number (606944).

2^1820829 is an apocalyptic number.

It is an amenable number.

1820829 is a deficient number, since it is larger than the sum of its proper divisors (606947).

1820829 is an equidigital number, since it uses as much as digits as its factorization.

1820829 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606946.

The product of its (nonzero) digits is 2304, while the sum is 30.

The square root of 1820829 is about 1349.3809691855. The cubic root of 1820829 is about 122.1114497115. Note that the first 3 decimals are identical.

The spelling of 1820829 in words is "one million, eight hundred twenty thousand, eight hundred twenty-nine".