138284725 has 12 divisors (see below), whose sum is σ = 176108644. Its totient is φ = 107637120.

The previous prime is 138284711. The next prime is 138284737. The reversal of 138284725 is 527482831.

It is a happy number.

138284725 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 6 ways, for example, as 1347921 + 136936804 = 1161^2 + 11702^2 .

It is a de Polignac number, because none of the positive numbers 2^k-138284725 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73824 + ... + 75673.

Almost surely, 2^138284725 is an apocalyptic number.

It is an amenable number.

138284725 is a deficient number, since it is larger than the sum of its proper divisors (37823919).

138284725 is a wasteful number, since it uses less digits than its factorization.

138284725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149544 (or 149539 counting only the distinct ones).

The product of its digits is 107520, while the sum is 40.

The square root of 138284725 is about 11759.4525807964. The cubic root of 138284725 is about 517.1200818009.

The spelling of 138284725 in words is "one hundred thirty-eight million, two hundred eighty-four thousand, seven hundred twenty-five".