138489689 has 32 divisors (see below), whose sum is σ = 163296000. Its totient is φ = 116363520.

The previous prime is 138489649. The next prime is 138489691. The reversal of 138489689 is 986984831.

It is not a de Polignac number, because 138489689 - 2⁸ = 138489433 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138489619) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 929387 + ... + 929535.

It is an arithmetic number, because the mean of its divisors is an integer number (5103000).

Almost surely, 2^138489689 is an apocalyptic number.

138489689 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

138489689 is a deficient number, since it is larger than the sum of its proper divisors (24806311).

138489689 is a wasteful number, since it uses less digits than its factorization.

138489689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305.

The product of its digits is 2985984, while the sum is 56.

The square root of 138489689 is about 11768.1642153736. The cubic root of 138489689 is about 517.3754454532.

The spelling of 138489689 in words is "one hundred thirty-eight million, four hundred eighty-nine thousand, six hundred eighty-nine".