138244472 has 8 divisors (see below), whose sum is σ = 259208400. Its totient is φ = 69122232.

The previous prime is 138244471. The next prime is 138244481. The reversal of 138244472 is 274442831.

138244472 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×138244472² = 38223068077117568, 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 as a sum of consecutive naturals, namely, 8640272 + ... + 8640287.

It is an arithmetic number, because the mean of its divisors is an integer number (32401050).

Almost surely, 2^138244472 is an apocalyptic number.

It is an amenable number.

138244472 is a deficient number, since it is larger than the sum of its proper divisors (120963928).

138244472 is a wasteful number, since it uses less digits than its factorization.

138244472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17280565 (or 17280561 counting only the distinct ones).

The product of its digits is 43008, while the sum is 35.

The square root of 138244472 is about 11757.7409394832. The cubic root of 138244472 is about 517.0699011447.

It can be divided in two parts, 1382 and 44472, that added together give a palindrome (45854).

The spelling of 138244472 in words is "one hundred thirty-eight million, two hundred forty-four thousand, four hundred seventy-two".