138525785 has 4 divisors (see below), whose sum is σ = 166230948. Its totient is φ = 110820624.

The previous prime is 138525781. The next prime is 138525791. The reversal of 138525785 is 587525831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 62853184 + 75672601 = 7928^2 + 8699^2 .

It is a cyclic number.

It is not a de Polignac number, because 138525785 - 2² = 138525781 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138525781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13852574 + ... + 13852583.

It is an arithmetic number, because the mean of its divisors is an integer number (41557737).

Almost surely, 2^138525785 is an apocalyptic number.

It is an amenable number.

138525785 is a deficient number, since it is larger than the sum of its proper divisors (27705163).

138525785 is an equidigital number, since it uses as much as digits as its factorization.

138525785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27705162.

The product of its digits is 336000, while the sum is 44.

The square root of 138525785 is about 11769.6977446322. The cubic root of 138525785 is about 517.4203911863.

The spelling of 138525785 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, seven hundred eighty-five".