1820342 has 4 divisors (see below), whose sum is σ = 2730516. Its totient is φ = 910170.

The previous prime is 1820341. The next prime is 1820347. The reversal of 1820342 is 2430281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2430281 = 7 ⋅347183.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1820341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 455084 + ... + 455087.

It is an arithmetic number, because the mean of its divisors is an integer number (682629).

2^1820342 is an apocalyptic number.

1820342 is a deficient number, since it is larger than the sum of its proper divisors (910174).

1820342 is an equidigital number, since it uses as much as digits as its factorization.

1820342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910173.

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1820342 is about 1349.2005040023. The cubic root of 1820342 is about 122.1005620739.

The spelling of 1820342 in words is "one million, eight hundred twenty thousand, three hundred forty-two".