138369817 has 16 divisors (see below), whose sum is σ = 158163840. Its totient is φ = 120262912.

The previous prime is 138369797. The next prime is 138369853. The reversal of 138369817 is 718963831.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138369817 is a prime.

It is a super-2 number, since 2×138369817² = 38292412513226978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138369877) 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, 5238 + ... + 17440.

It is an arithmetic number, because the mean of its divisors is an integer number (9885240).

Almost surely, 2^138369817 is an apocalyptic number.

138369817 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

138369817 is a deficient number, since it is larger than the sum of its proper divisors (19794023).

138369817 is a wasteful number, since it uses less digits than its factorization.

138369817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12272.

The product of its digits is 217728, while the sum is 46.

The square root of 138369817 is about 11763.0700499487. The cubic root of 138369817 is about 517.2261281231.

It can be divided in two parts, 13836 and 9817, that added together give a triangular number (23653 = T₂₁₇).

The spelling of 138369817 in words is "one hundred thirty-eight million, three hundred sixty-nine thousand, eight hundred seventeen".