138618769 has 8 divisors (see below), whose sum is σ = 144898560. Its totient is φ = 132360096.

The previous prime is 138618749. The next prime is 138618787. The reversal of 138618769 is 967816831.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138618769 - 2⁹ = 138618257 is a prime.

It is a super-2 number, since 2×138618769² = 38430326238150722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138618709) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 8997 + ... + 18925.

It is an arithmetic number, because the mean of its divisors is an integer number (18112320).

Almost surely, 2^138618769 is an apocalyptic number.

It is an amenable number.

138618769 is a deficient number, since it is larger than the sum of its proper divisors (6279791).

138618769 is an equidigital number, since it uses as much as digits as its factorization.

138618769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10559.

The product of its digits is 435456, while the sum is 49.

The square root of 138618769 is about 11773.6472259024. The cubic root of 138618769 is about 517.5361363207.

The spelling of 138618769 in words is "one hundred thirty-eight million, six hundred eighteen thousand, seven hundred sixty-nine".