138415155 has 32 divisors (see below), whose sum is σ = 229920768. Its totient is φ = 71030400.

The previous prime is 138415129. The next prime is 138415163. The reversal of 138415155 is 551514831.

It is a happy number.

It is not a de Polignac number, because 138415155 - 2⁶ = 138415091 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90850 + ... + 92360.

It is an arithmetic number, because the mean of its divisors is an integer number (7185024).

Almost surely, 2^138415155 is an apocalyptic number.

138415155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138415155 is a deficient number, since it is larger than the sum of its proper divisors (91505613).

138415155 is a wasteful number, since it uses less digits than its factorization.

138415155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1747.

The product of its digits is 12000, while the sum is 33.

The square root of 138415155 is about 11764.9970250740. The cubic root of 138415155 is about 517.2826130753.

Adding to 138415155 its reverse (551514831), we get a palindrome (689929986).

The spelling of 138415155 in words is "one hundred thirty-eight million, four hundred fifteen thousand, one hundred fifty-five".