138440441 has 4 divisors (see below), whose sum is σ = 145726800. Its totient is φ = 131154084.

The previous prime is 138440417. The next prime is 138440447. The reversal of 138440441 is 144044831.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 138440441 - 2¹⁸ = 138178297 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 (138440447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3643151 + ... + 3643188.

It is an arithmetic number, because the mean of its divisors is an integer number (36431700).

Almost surely, 2^138440441 is an apocalyptic number.

It is an amenable number.

138440441 is a deficient number, since it is larger than the sum of its proper divisors (7286359).

138440441 is an equidigital number, since it uses as much as digits as its factorization.

138440441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7286358.

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 138440441 is about 11766.0716044056. The cubic root of 138440441 is about 517.3141106179.

The spelling of 138440441 in words is "one hundred thirty-eight million, four hundred forty thousand, four hundred forty-one".