138634265 has 16 divisors (see below), whose sum is σ = 207411840. Its totient is φ = 86421120.

The previous prime is 138634217. The next prime is 138634267. The reversal of 138634265 is 562436831.

It is not a de Polignac number, because 138634265 - 2⁸ = 138634009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138634267) 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, 179660 + ... + 180429.

It is an arithmetic number, because the mean of its divisors is an integer number (12963240).

Almost surely, 2^138634265 is an apocalyptic number.

It is an amenable number.

138634265 is a deficient number, since it is larger than the sum of its proper divisors (68777575).

138634265 is a wasteful number, since it uses less digits than its factorization.

138634265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 360112.

The product of its digits is 103680, while the sum is 38.

The square root of 138634265 is about 11774.3052873620. The cubic root of 138634265 is about 517.5554204846. Note that the first 3 decimals are identical.

The spelling of 138634265 in words is "one hundred thirty-eight million, six hundred thirty-four thousand, two hundred sixty-five".