1868813 has 2 divisors, whose sum is σ = 1868814. Its totient is φ = 1868812.

The previous prime is 1868807. The next prime is 1868837. The reversal of 1868813 is 3188681.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1844164 + 24649 = 1358^2 + 157^2 .

It is a cyclic number.

It is not a de Polignac number, because 1868813 - 2⁶ = 1868749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 934406 + 934407.

It is an arithmetic number, because the mean of its divisors is an integer number (934407).

2^1868813 is an apocalyptic number.

It is an amenable number.

1868813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868813 is an equidigital number, since it uses as much as digits as its factorization.

1868813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 35.

The square root of 1868813 is about 1367.0453540391. The cubic root of 1868813 is about 123.1748235576.

The spelling of 1868813 in words is "one million, eight hundred sixty-eight thousand, eight hundred thirteen".