138975252 has 24 divisors (see below), whose sum is σ = 349220256. Its totient is φ = 42761568.

The previous prime is 138975251. The next prime is 138975257. The reversal of 138975252 is 252579831.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138975251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445278 + ... + 445589.

It is an arithmetic number, because the mean of its divisors is an integer number (14550844).

Almost surely, 2^138975252 is an apocalyptic number.

138975252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

138975252 is an abundant number, since it is smaller than the sum of its proper divisors (210245004).

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

138975252 is a wasteful number, since it uses less digits than its factorization.

138975252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890887 (or 890885 counting only the distinct ones).

The product of its digits is 151200, while the sum is 42.

The square root of 138975252 is about 11788.7765268496. The cubic root of 138975252 is about 517.9794021912.

The spelling of 138975252 in words is "one hundred thirty-eight million, nine hundred seventy-five thousand, two hundred fifty-two".