1238681 has 2 divisors, whose sum is σ = 1238682. Its totient is φ = 1238680.

The previous prime is 1238659. The next prime is 1238683. The reversal of 1238681 is 1868321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 48400 = 1091^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1238681 - 2¹⁸ = 976537 is a prime.

It is a super-2 number, since 2×1238681² = 3068661239522, which contains 22 as substring.

Together with 1238683, it forms a pair of twin primes.

It is a Chen prime.

It is equal to p₉₅₆₄₅ and since 1238681 and 95645 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (1238683) 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, 619340 + 619341.

It is an arithmetic number, because the mean of its divisors is an integer number (619341).

2^1238681 is an apocalyptic number.

It is an amenable number.

1238681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1238681 is an equidigital number, since it uses as much as digits as its factorization.

1238681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2304, while the sum is 29.

The square root of 1238681 is about 1112.9604665036. The cubic root of 1238681 is about 107.3956008264.

The spelling of 1238681 in words is "one million, two hundred thirty-eight thousand, six hundred eighty-one".