1820434 has 16 divisors (see below), whose sum is σ = 3404736. Its totient is φ = 709200.

The previous prime is 1820431. The next prime is 1820449. The reversal of 1820434 is 4340281.

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

It is not an unprimeable number, because it can be changed into a prime (1820431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5757 + ... + 6064.

It is an arithmetic number, because the mean of its divisors is an integer number (212796).

2^1820434 is an apocalyptic number.

1820434 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

1820434 is a deficient number, since it is larger than the sum of its proper divisors (1584302).

1820434 is a wasteful number, since it uses less digits than its factorization.

1820434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11841.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1820434 is about 1349.2345978369. The cubic root of 1820434 is about 122.1026190248.

The spelling of 1820434 in words is "one million, eight hundred twenty thousand, four hundred thirty-four".