1851869 has 2 divisors, whose sum is σ = 1851870. Its totient is φ = 1851868.

The previous prime is 1851859. The next prime is 1851877. The reversal of 1851869 is 9681581.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1532644 + 319225 = 1238^2 + 565^2 .

It is a cyclic number.

It is not a de Polignac number, because 1851869 - 2¹⁶ = 1786333 is a prime.

It is a super-2 number, since 2×1851869² = 6858837586322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1851809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 925934 + 925935.

It is an arithmetic number, because the mean of its divisors is an integer number (925935).

2^1851869 is an apocalyptic number.

It is an amenable number.

1851869 is a deficient number, since it is larger than the sum of its proper divisors (1).

1851869 is an equidigital number, since it uses as much as digits as its factorization.

1851869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17280, while the sum is 38.

The square root of 1851869 is about 1360.8339354969. The cubic root of 1851869 is about 122.8014289994.

The spelling of 1851869 in words is "one million, eight hundred fifty-one thousand, eight hundred sixty-nine".