138287446 has 32 divisors (see below), whose sum is σ = 230791680. Its totient is φ = 61620000.

The previous prime is 138287423. The next prime is 138287447. The reversal of 138287446 is 644782831.

138287446 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138287447) 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 15 ways as a sum of consecutive naturals, for example, 436080 + ... + 436396.

It is an arithmetic number, because the mean of its divisors is an integer number (7212240).

Almost surely, 2^138287446 is an apocalyptic number.

138287446 is a deficient number, since it is larger than the sum of its proper divisors (92504234).

138287446 is a wasteful number, since it uses less digits than its factorization.

138287446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 660.

The product of its digits is 258048, while the sum is 43.

The square root of 138287446 is about 11759.5682743883. The cubic root of 138287446 is about 517.1234735337.

The spelling of 138287446 in words is "one hundred thirty-eight million, two hundred eighty-seven thousand, four hundred forty-six".