138448457 has 8 divisors (see below), whose sum is σ = 158308800. Its totient is φ = 118608624.

The previous prime is 138448447. The next prime is 138448463. The reversal of 138448457 is 754844831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138448457 - 2⁴ = 138448441 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138448447) 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, 14219 + ... + 21887.

It is an arithmetic number, because the mean of its divisors is an integer number (19788600).

Almost surely, 2^138448457 is an apocalyptic number.

It is an amenable number.

138448457 is a deficient number, since it is larger than the sum of its proper divisors (19860343).

138448457 is an equidigital number, since it uses as much as digits as its factorization.

138448457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10255.

The product of its digits is 430080, while the sum is 44.

The square root of 138448457 is about 11766.4122399311. The cubic root of 138448457 is about 517.3240949593.

The spelling of 138448457 in words is "one hundred thirty-eight million, four hundred forty-eight thousand, four hundred fifty-seven".