138522072 has 64 divisors (see below), whose sum is σ = 380026080. Its totient is φ = 41812992.

The previous prime is 138522071. The next prime is 138522073. The reversal of 138522072 is 270225831.

It is an interprime number because it is at equal distance from previous prime (138522071) and next prime (138522073).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138522071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12348 + ... + 20724.

Almost surely, 2^138522072 is an apocalyptic number.

138522072 is a gapful number since it is divisible by the number (12) 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 138522072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190013040).

138522072 is an abundant number, since it is smaller than the sum of its proper divisors (241504008).

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

138522072 is a wasteful number, since it uses less digits than its factorization.

138522072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8452 (or 8448 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 30.

The square root of 138522072 is about 11769.5400080037. The cubic root of 138522072 is about 517.4157682225.

The spelling of 138522072 in words is "one hundred thirty-eight million, five hundred twenty-two thousand, seventy-two".