138841445 has 8 divisors (see below), whose sum is σ = 166753944. Its totient is φ = 110977024.

The previous prime is 138841433. The next prime is 138841459. The reversal of 138841445 is 544148831.

It can be written as a sum of positive squares in 4 ways, for example, as 44809636 + 94031809 = 6694^2 + 9697^2 .

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 138841445 - 2²² = 134647141 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 138841399 and 138841408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5324 + ... + 17493.

It is an arithmetic number, because the mean of its divisors is an integer number (20844243).

Almost surely, 2^138841445 is an apocalyptic number.

It is an amenable number.

138841445 is a deficient number, since it is larger than the sum of its proper divisors (27912499).

138841445 is a wasteful number, since it uses less digits than its factorization.

138841445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24039.

The product of its digits is 61440, while the sum is 38.

The square root of 138841445 is about 11783.0999741155. The cubic root of 138841445 is about 517.8131099325.

The spelling of 138841445 in words is "one hundred thirty-eight million, eight hundred forty-one thousand, four hundred forty-five".