1806834821 has 16 divisors (see below), whose sum is σ = 2073643200. Its totient is φ = 1559040000.

The previous prime is 1806834803. The next prime is 1806834839. The reversal of 1806834821 is 1284386081.

It is an interprime number because it is at equal distance from previous prime (1806834803) and next prime (1806834839).

It is a de Polignac number, because none of the positive numbers 2^k-1806834821 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 (1806834881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29180 + ... + 66821.

It is an arithmetic number, because the mean of its divisors is an integer number (129602700).

Almost surely, 2^1806834821 is an apocalyptic number.

1806834821 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1806834821 is a deficient number, since it is larger than the sum of its proper divisors (266808379).

1806834821 is a wasteful number, since it uses less digits than its factorization.

1806834821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96100.

The product of its (nonzero) digits is 73728, while the sum is 41.

The square root of 1806834821 is about 42506.8796902337. The cubic root of 1806834821 is about 1217.9781123077.

The spelling of 1806834821 in words is "one billion, eight hundred six million, eight hundred thirty-four thousand, eight hundred twenty-one".