1819806 has 16 divisors (see below), whose sum is σ = 3798144. Its totient is φ = 580184.

The previous prime is 1819781. The next prime is 1819819. The reversal of 1819806 is 6089181.

1819806 = 673² + 674² + ... + 676².

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6456 + ... + 6731.

It is an arithmetic number, because the mean of its divisors is an integer number (237384).

2^1819806 is an apocalyptic number.

1819806 is an abundant number, since it is smaller than the sum of its proper divisors (1978338).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1819806 is a wasteful number, since it uses less digits than its factorization.

1819806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13215.

The product of its (nonzero) digits is 3456, while the sum is 33.

The square root of 1819806 is about 1349.0018532233. The cubic root of 1819806 is about 122.0885767206.

The spelling of 1819806 in words is "one million, eight hundred nineteen thousand, eight hundred six".