138209452 has 12 divisors (see below), whose sum is σ = 245273616. Its totient is φ = 68131280.

The previous prime is 138209441. The next prime is 138209459. The reversal of 138209452 is 254902831.

138209452 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

138209452 is strictly pandigital in base 9.

It is not an unprimeable number, because it can be changed into a prime (138209459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243043 + ... + 243610.

It is an arithmetic number, because the mean of its divisors is an integer number (20439468).

Almost surely, 2^138209452 is an apocalyptic number.

It is an amenable number.

138209452 is a deficient number, since it is larger than the sum of its proper divisors (107064164).

138209452 is a wasteful number, since it uses less digits than its factorization.

138209452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 486728 (or 486726 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 138209452 is about 11756.2516135033. The cubic root of 138209452 is about 517.0262361868.

The spelling of 138209452 in words is "one hundred thirty-eight million, two hundred nine thousand, four hundred fifty-two".