138424444 has 12 divisors (see below), whose sum is σ = 242884600. Its totient is φ = 69028848.

The previous prime is 138424423. The next prime is 138424457. The reversal of 138424444 is 444424831.

138424444 is digitally balanced in base 3 and base 9, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138424444² = 38322653393418272, which contains 22 as substring.

138424444 is strictly pandigital in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44139 + ... + 47170.

Almost surely, 2^138424444 is an apocalyptic number.

It is an amenable number.

138424444 is a deficient number, since it is larger than the sum of its proper divisors (104460156).

138424444 is a wasteful number, since it uses less digits than its factorization.

138424444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91692 (or 91690 counting only the distinct ones).

The product of its digits is 49152, while the sum is 34.

The square root of 138424444 is about 11765.3917911815. The cubic root of 138424444 is about 517.2941843773.

The spelling of 138424444 in words is "one hundred thirty-eight million, four hundred twenty-four thousand, four hundred forty-four".