1868239 has 2 divisors, whose sum is σ = 1868240. Its totient is φ = 1868238.

The previous prime is 1868231. The next prime is 1868257. The reversal of 1868239 is 9328681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1868239 - 2³ = 1868231 is a prime.

It is a super-2 number, since 2×1868239² = 6980633922242, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1868198 and 1868207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868231) 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, 934119 + 934120.

It is an arithmetic number, because the mean of its divisors is an integer number (934120).

2^1868239 is an apocalyptic number.

1868239 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868239 is an equidigital number, since it uses as much as digits as its factorization.

1868239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 1868239 is about 1366.8353960884. The cubic root of 1868239 is about 123.1622113471.

It can be divided in two parts, 18682 and 39, that added together give a triangular number (18721 = T₁₉₃).

The spelling of 1868239 in words is "one million, eight hundred sixty-eight thousand, two hundred thirty-nine".