138857415 has 16 divisors (see below), whose sum is σ = 233865600. Its totient is φ = 70159392.

The previous prime is 138857413. The next prime is 138857429. The reversal of 138857415 is 514758831.

138857415 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 138857415 - 2¹ = 138857413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138857413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 243325 + ... + 243894.

It is an arithmetic number, because the mean of its divisors is an integer number (14616600).

Almost surely, 2^138857415 is an apocalyptic number.

138857415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138857415 is a deficient number, since it is larger than the sum of its proper divisors (95008185).

138857415 is a wasteful number, since it uses less digits than its factorization.

138857415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487246.

The product of its digits is 134400, while the sum is 42.

The square root of 138857415 is about 11783.7776201013. Note that the first 3 decimals coincide. The cubic root of 138857415 is about 517.8329626941.

The spelling of 138857415 in words is "one hundred thirty-eight million, eight hundred fifty-seven thousand, four hundred fifteen".