138006489 has 4 divisors (see below), whose sum is σ = 184008656. Its totient is φ = 92004324.

The previous prime is 138006469. The next prime is 138006499. The reversal of 138006489 is 984600831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 984600831 = 3 ⋅328200277.

It is not a de Polignac number, because 138006489 - 2⁷ = 138006361 is a prime.

It is a super-2 number, since 2×138006489² = 38091582012214242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138006419) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23001079 + ... + 23001084.

It is an arithmetic number, because the mean of its divisors is an integer number (46002164).

Almost surely, 2^138006489 is an apocalyptic number.

It is an amenable number.

138006489 is a deficient number, since it is larger than the sum of its proper divisors (46002167).

138006489 is an equidigital number, since it uses as much as digits as its factorization.

138006489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46002166.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 138006489 is about 11747.6163114055. The cubic root of 138006489 is about 516.7730248379.

The spelling of 138006489 in words is "one hundred thirty-eight million, six thousand, four hundred eighty-nine".