138773288 has 8 divisors (see below), whose sum is σ = 260199930. Its totient is φ = 69386640.

The previous prime is 138773287. The next prime is 138773303. The reversal of 138773288 is 882377831.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 113592964 + 25180324 = 10658^2 + 5018^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (138773287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8673323 + ... + 8673338.

Almost surely, 2^138773288 is an apocalyptic number.

It is an amenable number.

138773288 is a deficient number, since it is larger than the sum of its proper divisors (121426642).

138773288 is a wasteful number, since it uses less digits than its factorization.

138773288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17346667 (or 17346663 counting only the distinct ones).

The product of its digits is 451584, while the sum is 47.

The square root of 138773288 is about 11780.2074684617. The cubic root of 138773288 is about 517.7283649086.

The spelling of 138773288 in words is "one hundred thirty-eight million, seven hundred seventy-three thousand, two hundred eighty-eight".