138145772 has 24 divisors (see below), whose sum is σ = 247118256. Its totient is φ = 67549248.

The previous prime is 138145771. The next prime is 138145783. The reversal of 138145772 is 277541831.

It is not an unprimeable number, because it can be changed into a prime (138145771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78203 + ... + 79949.

It is an arithmetic number, because the mean of its divisors is an integer number (10296594).

Almost surely, 2^138145772 is an apocalyptic number.

It is an amenable number.

138145772 is a deficient number, since it is larger than the sum of its proper divisors (108972484).

138145772 is a wasteful number, since it uses less digits than its factorization.

138145772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177 (or 2175 counting only the distinct ones).

The product of its digits is 47040, while the sum is 38.

The square root of 138145772 is about 11753.5429552114. The cubic root of 138145772 is about 516.9468173816.

The spelling of 138145772 in words is "one hundred thirty-eight million, one hundred forty-five thousand, seven hundred seventy-two".