1820830 has 16 divisors (see below), whose sum is σ = 3575664. Its totient is φ = 662080.

The previous prime is 1820821. The next prime is 1820837. The reversal of 1820830 is 380281.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8167 + ... + 8386.

It is an arithmetic number, because the mean of its divisors is an integer number (223479).

2^1820830 is an apocalyptic number.

1820830 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1820830 is a deficient number, since it is larger than the sum of its proper divisors (1754834).

1820830 is a wasteful number, since it uses less digits than its factorization.

1820830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16571.

The product of its (nonzero) digits is 384, while the sum is 22.

The square root of 1820830 is about 1349.3813397257. The cubic root of 1820830 is about 122.1114720660. Note that the first 3 decimals are identical.

The spelling of 1820830 in words is "one million, eight hundred twenty thousand, eight hundred thirty".