138493441 has 4 divisors (see below), whose sum is σ = 146640132. Its totient is φ = 130346752.

The previous prime is 138493409. The next prime is 138493447. The reversal of 138493441 is 144394831.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 127577025 + 10916416 = 11295^2 + 3304^2 .

It is not a de Polignac number, because 138493441 - 2⁵ = 138493409 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 138493441.

It is not an unprimeable number, because it can be changed into a prime (138493447) 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, 4073320 + ... + 4073353.

It is an arithmetic number, because the mean of its divisors is an integer number (36660033).

Almost surely, 2^138493441 is an apocalyptic number.

It is an amenable number.

138493441 is a deficient number, since it is larger than the sum of its proper divisors (8146691).

138493441 is an equidigital number, since it uses as much as digits as its factorization.

138493441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8146690.

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

The square root of 138493441 is about 11768.3236274331. The cubic root of 138493441 is about 517.3801177027.

The spelling of 138493441 in words is "one hundred thirty-eight million, four hundred ninety-three thousand, four hundred forty-one".