138633841 has 4 divisors (see below), whose sum is σ = 138709732. Its totient is φ = 138557952.

The previous prime is 138633839. The next prime is 138633853. The reversal of 138633841 is 148336831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 148336831 = 1289 ⋅115079.

It can be written as a sum of positive squares in 2 ways, for example, as 68409441 + 70224400 = 8271^2 + 8380^2 .

It is a cyclic number.

It is not a de Polignac number, because 138633841 - 2¹ = 138633839 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138633841.

It is not an unprimeable number, because it can be changed into a prime (138633871) 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 3 ways as a sum of consecutive naturals, for example, 35136 + ... + 38881.

It is an arithmetic number, because the mean of its divisors is an integer number (34677433).

Almost surely, 2^138633841 is an apocalyptic number.

It is an amenable number.

138633841 is a deficient number, since it is larger than the sum of its proper divisors (75891).

138633841 is an equidigital number, since it uses as much as digits as its factorization.

138633841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75890.

The product of its digits is 41472, while the sum is 37.

The square root of 138633841 is about 11774.2872820396. The cubic root of 138633841 is about 517.5548928523.

The spelling of 138633841 in words is "one hundred thirty-eight million, six hundred thirty-three thousand, eight hundred forty-one".