138965505 has 32 divisors (see below), whose sum is σ = 255032064. Its totient is φ = 63296256.

The previous prime is 138965461. The next prime is 138965513. The reversal of 138965505 is 505569831.

It is not a de Polignac number, because 138965505 - 2¹⁰ = 138964481 is a prime.

It is a super-2 number, since 2×138965505² = 38622823159810050, which contains 22 as substring.

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, 28507 + ... + 33023.

It is an arithmetic number, because the mean of its divisors is an integer number (7969752).

Almost surely, 2^138965505 is an apocalyptic number.

138965505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

138965505 is a deficient number, since it is larger than the sum of its proper divisors (116066559).

138965505 is a wasteful number, since it uses less digits than its factorization.

138965505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4825.

The product of its (nonzero) digits is 162000, while the sum is 42.

The square root of 138965505 is about 11788.3631179227. The cubic root of 138965505 is about 517.9672924494.

The spelling of 138965505 in words is "one hundred thirty-eight million, nine hundred sixty-five thousand, five hundred five".