138452478 has 8 divisors (see below), whose sum is σ = 276904968. Its totient is φ = 46150824.

The previous prime is 138452453. The next prime is 138452507. The reversal of 138452478 is 874254831.

138452478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

138452478 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11537701 + ... + 11537712.

It is an arithmetic number, because the mean of its divisors is an integer number (34613121).

Almost surely, 2^138452478 is an apocalyptic number.

138452478 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

138452478 is a wasteful number, since it uses less digits than its factorization.

138452478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23075418.

The product of its digits is 215040, while the sum is 42.

The square root of 138452478 is about 11766.5831064077. The cubic root of 138452478 is about 517.3291031770.

The spelling of 138452478 in words is "one hundred thirty-eight million, four hundred fifty-two thousand, four hundred seventy-eight".