1820087 has 2 divisors, whose sum is σ = 1820088. Its totient is φ = 1820086.

The previous prime is 1820051. The next prime is 1820089. The reversal of 1820087 is 7800281.

It is a strong prime.

It is an emirp because it is prime and its reverse (7800281) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1820087 - 2⁶ = 1820023 is a prime.

Together with 1820089, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910043 + 910044.

It is an arithmetic number, because the mean of its divisors is an integer number (910044).

2^1820087 is an apocalyptic number.

1820087 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820087 is an equidigital number, since it uses as much as digits as its factorization.

1820087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 26.

The square root of 1820087 is about 1349.1060002832. The cubic root of 1820087 is about 122.0948603802.

The spelling of 1820087 in words is "one million, eight hundred twenty thousand, eighty-seven".