138969841 has 8 divisors (see below), whose sum is σ = 145139904. Its totient is φ = 132810480.

The previous prime is 138969799. The next prime is 138969847. The reversal of 138969841 is 148969831.

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 138969841 - 2⁹ = 138969329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138969847) 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, 35806 + ... + 39496.

It is an arithmetic number, because the mean of its divisors is an integer number (18142488).

Almost surely, 2^138969841 is an apocalyptic number.

It is an amenable number.

138969841 is a deficient number, since it is larger than the sum of its proper divisors (6170063).

138969841 is a wasteful number, since it uses less digits than its factorization.

138969841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5351.

The product of its digits is 373248, while the sum is 49.

The square root of 138969841 is about 11788.5470266696. The cubic root of 138969841 is about 517.9726795964.

The spelling of 138969841 in words is "one hundred thirty-eight million, nine hundred sixty-nine thousand, eight hundred forty-one".