138534777 has 24 divisors (see below), whose sum is σ = 209777568. Its totient is φ = 87998400.

The previous prime is 138534743. The next prime is 138534779. The reversal of 138534777 is 777435831.

It is not a de Polignac number, because 138534777 - 2⁶ = 138534713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138534779) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11502 + ... + 20232.

It is an arithmetic number, because the mean of its divisors is an integer number (8740732).

Almost surely, 2^138534777 is an apocalyptic number.

It is an amenable number.

138534777 is a deficient number, since it is larger than the sum of its proper divisors (71242791).

138534777 is a wasteful number, since it uses less digits than its factorization.

138534777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8821 (or 8818 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 138534777 is about 11770.0797363484. The cubic root of 138534777 is about 517.4315865593.

The spelling of 138534777 in words is "one hundred thirty-eight million, five hundred thirty-four thousand, seven hundred seventy-seven".