1801867 has 2 divisors, whose sum is σ = 1801868. Its totient is φ = 1801866.

The previous prime is 1801853. The next prime is 1801871. The reversal of 1801867 is 7681081.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1801867 - 2¹⁵ = 1769099 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1801817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900933 + 900934.

It is an arithmetic number, because the mean of its divisors is an integer number (900934).

2^1801867 is an apocalyptic number.

1801867 is a deficient number, since it is larger than the sum of its proper divisors (1).

1801867 is an equidigital number, since it uses as much as digits as its factorization.

1801867 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 1801867 is about 1342.3363959902. The cubic root of 1801867 is about 121.6860826794.

The spelling of 1801867 in words is "one million, eight hundred one thousand, eight hundred sixty-seven".