1872001 has 2 divisors, whose sum is σ = 1872002. Its totient is φ = 1872000.

The previous prime is 1871983. The next prime is 1872007. The reversal of 1872001 is 1002781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1752976 + 119025 = 1324^2 + 345^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872001 - 2¹¹ = 1869953 is a prime.

It is an Ulam number.

It is equal to p₁₄₀₀₉₅ and since 1872001 and 140095 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1872001.

It is not a weakly prime, because it can be changed into another prime (1872007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936000 + 936001.

It is an arithmetic number, because the mean of its divisors is an integer number (936001).

2^1872001 is an apocalyptic number.

It is an amenable number.

1872001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872001 is an equidigital number, since it uses as much as digits as its factorization.

1872001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1872001 is about 1368.2108755598. The cubic root of 1872001 is about 123.2448249003.

Adding to 1872001 its reverse (1002781), we get a palindrome (2874782).

The spelling of 1872001 in words is "one million, eight hundred seventy-two thousand, one".