138257320 has 16 divisors (see below), whose sum is σ = 311079060. Its totient is φ = 55302912.

The previous prime is 138257263. The next prime is 138257321. The reversal of 138257320 is 23752831.

It can be written as a sum of positive squares in 2 ways, for example, as 112063396 + 26193924 = 10586^2 + 5118^2 .

It is not an unprimeable number, because it can be changed into a prime (138257321) 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, 1728177 + ... + 1728256.

Almost surely, 2^138257320 is an apocalyptic number.

138257320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138257320 is an abundant number, since it is smaller than the sum of its proper divisors (172821740).

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

138257320 is a wasteful number, since it uses less digits than its factorization.

138257320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3456444 (or 3456440 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 138257320 is about 11758.2872902477. The cubic root of 138257320 is about 517.0859189239.

The spelling of 138257320 in words is "one hundred thirty-eight million, two hundred fifty-seven thousand, three hundred twenty".