138895457 has 8 divisors (see below), whose sum is σ = 149841576. Its totient is φ = 128257792.

The previous prime is 138895451. The next prime is 138895483. The reversal of 138895457 is 754598831.

It can be written as a sum of positive squares in 4 ways, for example, as 11566801 + 127328656 = 3401^2 + 11284^2 .

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

It is not a de Polignac number, because 138895457 - 2¹⁴ = 138879073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138895451) 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, 76178 + ... + 77979.

It is an arithmetic number, because the mean of its divisors is an integer number (18730197).

Almost surely, 2^138895457 is an apocalyptic number.

138895457 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138895457 is a deficient number, since it is larger than the sum of its proper divisors (10946119).

138895457 is a wasteful number, since it uses less digits than its factorization.

138895457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154227.

The product of its digits is 1209600, while the sum is 50.

The square root of 138895457 is about 11785.3916778357. The cubic root of 138895457 is about 517.8802476563.

The spelling of 138895457 in words is "one hundred thirty-eight million, eight hundred ninety-five thousand, four hundred fifty-seven".