138962779 has 2 divisors, whose sum is σ = 138962780. Its totient is φ = 138962778.

The previous prime is 138962771. The next prime is 138962821. The reversal of 138962779 is 977269831.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 138962779 - 2³ = 138962771 is a prime.

It is not a weakly prime, because it can be changed into another prime (138962771) 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, 69481389 + 69481390.

It is an arithmetic number, because the mean of its divisors is an integer number (69481390).

Almost surely, 2^138962779 is an apocalyptic number.

138962779 is a deficient number, since it is larger than the sum of its proper divisors (1).

138962779 is an equidigital number, since it uses as much as digits as its factorization.

138962779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1143072, while the sum is 52.

The square root of 138962779 is about 11788.2474948569. The cubic root of 138962779 is about 517.9639055464.

The spelling of 138962779 in words is "one hundred thirty-eight million, nine hundred sixty-two thousand, seven hundred seventy-nine".