138217635 has 12 divisors (see below), whose sum is σ = 239577312. Its totient is φ = 73716048.

The previous prime is 138217627. The next prime is 138217663. The reversal of 138217635 is 536712831.

138217635 is a `hidden beast` number, since 1 + 3 + 8 + 2 + 17 + 635 = 666.

It is not a de Polignac number, because 138217635 - 2³ = 138217627 is a prime.

It is a super-2 number, since 2×138217635² = 38208229249986450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 138217635.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1535707 + ... + 1535796.

It is an arithmetic number, because the mean of its divisors is an integer number (19964776).

Almost surely, 2^138217635 is an apocalyptic number.

138217635 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

138217635 is a deficient number, since it is larger than the sum of its proper divisors (101359677).

138217635 is a wasteful number, since it uses less digits than its factorization.

138217635 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3071514 (or 3071511 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 138217635 is about 11756.5996359492. The cubic root of 138217635 is about 517.0364398840.

The spelling of 138217635 in words is "one hundred thirty-eight million, two hundred seventeen thousand, six hundred thirty-five".