138229489 has 8 divisors (see below), whose sum is σ = 139105512. Its totient is φ = 137356800.

The previous prime is 138229463. The next prime is 138229493. The reversal of 138229489 is 984922831.

It can be written as a sum of positive squares in 4 ways, for example, as 68757264 + 69472225 = 8292^2 + 8335^2 .

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 138229489 - 2¹⁹ = 137705201 is a prime.

It is a super-2 number, since 2×138229489² = 38214783258402242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138229439) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 196839 + ... + 197539.

It is an arithmetic number, because the mean of its divisors is an integer number (17388189).

Almost surely, 2^138229489 is an apocalyptic number.

It is an amenable number.

138229489 is a deficient number, since it is larger than the sum of its proper divisors (876023).

138229489 is an equidigital number, since it uses as much as digits as its factorization.

138229489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667.

The product of its digits is 248832, while the sum is 46.

The square root of 138229489 is about 11757.1037675101. The cubic root of 138229489 is about 517.0512203779.

The spelling of 138229489 in words is "one hundred thirty-eight million, two hundred twenty-nine thousand, four hundred eighty-nine".