138873401 has 2 divisors, whose sum is σ = 138873402. Its totient is φ = 138873400.

The previous prime is 138873353. The next prime is 138873443. The reversal of 138873401 is 104378831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 136913401 + 1960000 = 11701^2 + 1400^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138873401 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138873001) 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, 69436700 + 69436701.

It is an arithmetic number, because the mean of its divisors is an integer number (69436701).

Almost surely, 2^138873401 is an apocalyptic number.

It is an amenable number.

138873401 is a deficient number, since it is larger than the sum of its proper divisors (1).

138873401 is an equidigital number, since it uses as much as digits as its factorization.

138873401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 138873401 is about 11784.4559059806. The cubic root of 138873401 is about 517.8528338213.

The spelling of 138873401 in words is "one hundred thirty-eight million, eight hundred seventy-three thousand, four hundred one".