138525786 has 24 divisors (see below), whose sum is σ = 343016544. Its totient is φ = 39578760.

The previous prime is 138525781. The next prime is 138525791. The reversal of 138525786 is 687525831.

It is an interprime number because it is at equal distance from previous prime (138525781) and next prime (138525791).

It is a Curzon 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 11 ways as a sum of consecutive naturals, for example, 549580 + ... + 549831.

It is an arithmetic number, because the mean of its divisors is an integer number (14292356).

Almost surely, 2^138525786 is an apocalyptic number.

138525786 is an abundant number, since it is smaller than the sum of its proper divisors (204490758).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138525786 is a wasteful number, since it uses less digits than its factorization.

138525786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099426 (or 1099423 counting only the distinct ones).

The product of its digits is 403200, while the sum is 45.

The square root of 138525786 is about 11769.6977871142. The cubic root of 138525786 is about 517.4203924314.

Adding to 138525786 its sum of digits (45), we get a palindrome (138525831).

The spelling of 138525786 in words is "one hundred thirty-eight million, five hundred twenty-five thousand, seven hundred eighty-six".