1820237 has 2 divisors, whose sum is σ = 1820238. Its totient is φ = 1820236.

The previous prime is 1820213. The next prime is 1820249. The reversal of 1820237 is 7320281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1012036 + 808201 = 1006^2 + 899^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820237 - 2¹² = 1816141 is a prime.

It is a Chen prime.

It is equal to p₁₃₆₄₆₃ and since 1820237 and 136463 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820267) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910118 + 910119.

It is an arithmetic number, because the mean of its divisors is an integer number (910119).

2^1820237 is an apocalyptic number.

It is an amenable number.

1820237 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820237 is an equidigital number, since it uses as much as digits as its factorization.

1820237 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 1820237 is about 1349.1615915079. The cubic root of 1820237 is about 122.0982143822.

The spelling of 1820237 in words is "one million, eight hundred twenty thousand, two hundred thirty-seven".