138244470 has 128 divisors (see below), whose sum is σ = 414167040. Its totient is φ = 28753920.

The previous prime is 138244451. The next prime is 138244471. The reversal of 138244470 is 74442831.

138244470 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×138244470² = 38223066971161800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138244471) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 215350 + ... + 215990.

It is an arithmetic number, because the mean of its divisors is an integer number (3235680).

Almost surely, 2^138244470 is an apocalyptic number.

138244470 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 138244470, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (207083520).

138244470 is an abundant number, since it is smaller than the sum of its proper divisors (275922570).

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

138244470 is a wasteful number, since it uses less digits than its factorization.

138244470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750.

The product of its (nonzero) digits is 21504, while the sum is 33.

The square root of 138244470 is about 11757.7408544329. The cubic root of 138244470 is about 517.0698986512.

The spelling of 138244470 in words is "one hundred thirty-eight million, two hundred forty-four thousand, four hundred seventy".