138745771 has 16 divisors (see below), whose sum is σ = 149184000. Its totient is φ = 128651328.

The previous prime is 138745759. The next prime is 138745799. The reversal of 138745771 is 177547831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138745771 - 2⁷ = 138745643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138745741) 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 in 15 ways as a sum of consecutive naturals, for example, 231330 + ... + 231928.

It is an arithmetic number, because the mean of its divisors is an integer number (9324000).

Almost surely, 2^138745771 is an apocalyptic number.

138745771 is a deficient number, since it is larger than the sum of its proper divisors (10438229).

138745771 is a wasteful number, since it uses less digits than its factorization.

138745771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858.

The product of its digits is 164640, while the sum is 43.

The square root of 138745771 is about 11779.0394769692. The cubic root of 138745771 is about 517.6941429692.

The spelling of 138745771 in words is "one hundred thirty-eight million, seven hundred forty-five thousand, seven hundred seventy-one".