138645446 has 8 divisors (see below), whose sum is σ = 210305160. Its totient is φ = 68543728.

The previous prime is 138645439. The next prime is 138645461. The reversal of 138645446 is 644546831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

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, 389276 + ... + 389631.

It is an arithmetic number, because the mean of its divisors is an integer number (26288145).

Almost surely, 2^138645446 is an apocalyptic number.

138645446 is a deficient number, since it is larger than the sum of its proper divisors (71659714).

138645446 is an equidigital number, since it uses as much as digits as its factorization.

138645446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778998.

The product of its digits is 276480, while the sum is 41.

The square root of 138645446 is about 11774.7800828720. The cubic root of 138645446 is about 517.5693339078.

The spelling of 138645446 in words is "one hundred thirty-eight million, six hundred forty-five thousand, four hundred forty-six".