138663369 has 48 divisors (see below), whose sum is σ = 221981760. Its totient is φ = 82892160.

The previous prime is 138663367. The next prime is 138663377. The reversal of 138663369 is 963366831.

138663369 is a `hidden beast` number, since 1 + 3 + 8 + 6 + 633 + 6 + 9 = 666.

It is not a de Polignac number, because 138663369 - 2¹ = 138663367 is a prime.

It is a super-2 number, since 2×138663369² = 38455059804860322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138663361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1058434 + ... + 1058564.

It is an arithmetic number, because the mean of its divisors is an integer number (4624620).

Almost surely, 2^138663369 is an apocalyptic number.

It is an amenable number.

138663369 is a deficient number, since it is larger than the sum of its proper divisors (83318391).

138663369 is a wasteful number, since it uses less digits than its factorization.

138663369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 339 counting only the distinct ones).

The product of its digits is 419904, while the sum is 45.

The square root of 138663369 is about 11775.5411340626. The cubic root of 138663369 is about 517.5916353867.

The spelling of 138663369 in words is "one hundred thirty-eight million, six hundred sixty-three thousand, three hundred sixty-nine".