138746556 has 72 divisors (see below), whose sum is σ = 390761280. Its totient is φ = 41215104.

The previous prime is 138746549. The next prime is 138746561. The reversal of 138746556 is 655647831.

138746556 is a `hidden beast` number, since 13 + 87 + 4 + 6 + 556 = 666.

It is a super-2 number, since 2×138746556² = 38501213603722272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8461 + ... + 18683.

It is an arithmetic number, because the mean of its divisors is an integer number (5427240).

Almost surely, 2^138746556 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138746556, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195380640).

138746556 is an abundant number, since it is smaller than the sum of its proper divisors (252014724).

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

138746556 is a wasteful number, since it uses less digits than its factorization.

138746556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10275 (or 10270 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 138746556 is about 11779.0727988242. The cubic root of 138746556 is about 517.6951193092.

The spelling of 138746556 in words is "one hundred thirty-eight million, seven hundred forty-six thousand, five hundred fifty-six".