138844477 has 2 divisors, whose sum is σ = 138844478. Its totient is φ = 138844476.

The previous prime is 138844451. The next prime is 138844487. The reversal of 138844477 is 774448831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 80030916 + 58813561 = 8946^2 + 7669^2 .

It is a cyclic number.

It is not a de Polignac number, because 138844477 - 2¹⁵ = 138811709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138844417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69422238 + 69422239.

It is an arithmetic number, because the mean of its divisors is an integer number (69422239).

Almost surely, 2^138844477 is an apocalyptic number.

It is an amenable number.

138844477 is a deficient number, since it is larger than the sum of its proper divisors (1).

138844477 is an equidigital number, since it uses as much as digits as its factorization.

138844477 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 602112, while the sum is 46.

The square root of 138844477 is about 11783.2286322553. The cubic root of 138844477 is about 517.8168792151.

The spelling of 138844477 in words is "one hundred thirty-eight million, eight hundred forty-four thousand, four hundred seventy-seven".