138222478 has 16 divisors (see below), whose sum is σ = 221798304. Its totient is φ = 64373760.

The previous prime is 138222467. The next prime is 138222503. The reversal of 138222478 is 874222831.

138222478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17658 + ... + 24253.

It is an arithmetic number, because the mean of its divisors is an integer number (13862394).

Almost surely, 2^138222478 is an apocalyptic number.

138222478 is a deficient number, since it is larger than the sum of its proper divisors (83575826).

138222478 is a wasteful number, since it uses less digits than its factorization.

138222478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42027.

The product of its digits is 43008, while the sum is 37.

The square root of 138222478 is about 11756.8056035643. The cubic root of 138222478 is about 517.0424786171.

The spelling of 138222478 in words is "one hundred thirty-eight million, two hundred twenty-two thousand, four hundred seventy-eight".