138626473 has 2 divisors, whose sum is σ = 138626474. Its totient is φ = 138626472.

The previous prime is 138626443. The next prime is 138626491. The reversal of 138626473 is 374626831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138227049 + 399424 = 11757^2 + 632^2 .

It is a cyclic number.

It is not a de Polignac number, because 138626473 - 2²⁵ = 105072041 is a prime.

It is not a weakly prime, because it can be changed into another prime (138626443) 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, 69313236 + 69313237.

It is an arithmetic number, because the mean of its divisors is an integer number (69313237).

Almost surely, 2^138626473 is an apocalyptic number.

It is an amenable number.

138626473 is a deficient number, since it is larger than the sum of its proper divisors (1).

138626473 is an equidigital number, since it uses as much as digits as its factorization.

138626473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145152, while the sum is 40.

The square root of 138626473 is about 11773.9743927019. The cubic root of 138626473 is about 517.5457238260.

The spelling of 138626473 in words is "one hundred thirty-eight million, six hundred twenty-six thousand, four hundred seventy-three".