1820254 has 4 divisors (see below), whose sum is σ = 2730384. Its totient is φ = 910126.

The previous prime is 1820249. The next prime is 1820261. The reversal of 1820254 is 4520281.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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, 455062 + ... + 455065.

It is an arithmetic number, because the mean of its divisors is an integer number (682596).

2^1820254 is an apocalyptic number.

1820254 is a deficient number, since it is larger than the sum of its proper divisors (910130).

1820254 is an equidigital number, since it uses as much as digits as its factorization.

1820254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 910129.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 1820254 is about 1349.1678917021. The cubic root of 1820254 is about 122.0985944908.

The spelling of 1820254 in words is "one million, eight hundred twenty thousand, two hundred fifty-four".