138571216 has 120 divisors (see below), whose sum is σ = 340833096. Its totient is φ = 54190080.

The previous prime is 138571211. The next prime is 138571219. The reversal of 138571216 is 612175831.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 79281216 + 59290000 = 8904^2 + 7700^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138571211) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 492996 + ... + 493276.

Almost surely, 2^138571216 is an apocalyptic number.

138571216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138571216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (170416548).

138571216 is an abundant number, since it is smaller than the sum of its proper divisors (202261880).

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

138571216 is a wasteful number, since it uses less digits than its factorization.

138571216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 344 counting only the distinct ones).

The product of its digits is 10080, while the sum is 34.

The square root of 138571216 is about 11771.6275850028. The cubic root of 138571216 is about 517.4769495050.

The spelling of 138571216 in words is "one hundred thirty-eight million, five hundred seventy-one thousand, two hundred sixteen".