138020925 has 24 divisors (see below), whose sum is σ = 260794816. Its totient is φ = 63095040.

The previous prime is 138020903. The next prime is 138020929. The reversal of 138020925 is 529020831.

It is a happy number.

It is not a de Polignac number, because 138020925 - 2⁵ = 138020893 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 138020892 and 138020901.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138020929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130924 + ... + 131973.

Almost surely, 2^138020925 is an apocalyptic number.

138020925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138020925 is a deficient number, since it is larger than the sum of its proper divisors (122773891).

138020925 is a wasteful number, since it uses less digits than its factorization.

138020925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262917 (or 262912 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 138020925 is about 11748.2307178571. The cubic root of 138020925 is about 516.7910430131.

The spelling of 138020925 in words is "one hundred thirty-eight million, twenty thousand, nine hundred twenty-five".