138457047 has 8 divisors (see below), whose sum is σ = 194325760. Its totient is φ = 87446520.

The previous prime is 138457003. The next prime is 138457063. The reversal of 138457047 is 740754831.

138457047 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.

It is not a de Polignac number, because 138457047 - 2¹⁶ = 138391511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138456996 and 138457014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138457097) 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, 1214479 + ... + 1214592.

It is an arithmetic number, because the mean of its divisors is an integer number (24290720).

Almost surely, 2^138457047 is an apocalyptic number.

138457047 is a deficient number, since it is larger than the sum of its proper divisors (55868713).

138457047 is a wasteful number, since it uses less digits than its factorization.

138457047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2429093.

The product of its (nonzero) digits is 94080, while the sum is 39.

The square root of 138457047 is about 11766.7772563264. Note that the first 3 decimals coincide. The cubic root of 138457047 is about 517.3347938195.

The spelling of 138457047 in words is "one hundred thirty-eight million, four hundred fifty-seven thousand, forty-seven".