138044466 has 128 divisors (see below), whose sum is σ = 371520000. Its totient is φ = 37933056.

The previous prime is 138044449. The next prime is 138044497. The reversal of 138044466 is 664440831.

It is a super-3 number, since 3×138044466³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138044466.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 537010 + ... + 537266.

It is an arithmetic number, because the mean of its divisors is an integer number (2902500).

Almost surely, 2^138044466 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138044466, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (185760000).

138044466 is an abundant number, since it is smaller than the sum of its proper divisors (233475534).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

138044466 is a wasteful number, since it uses less digits than its factorization.

138044466 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 298 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 138044466 is about 11749.2325706831. The cubic root of 138044466 is about 516.8204228247.

The spelling of 138044466 in words is "one hundred thirty-eight million, forty-four thousand, four hundred sixty-six".