138042486 has 48 divisors (see below), whose sum is σ = 323372400. Its totient is φ = 42410304.

The previous prime is 138042479. The next prime is 138042503. The reversal of 138042486 is 684240831.

138042486 is a `hidden beast` number, since 138 + 0 + 42 + 486 = 666.

138042486 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138042486.

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, 7200 + ... + 18108.

It is an arithmetic number, because the mean of its divisors is an integer number (6736925).

Almost surely, 2^138042486 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 138042486, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161686200).

138042486 is an abundant number, since it is smaller than the sum of its proper divisors (185329914).

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

138042486 is a wasteful number, since it uses less digits than its factorization.

138042486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10973 (or 10970 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 138042486 is about 11749.1483095584. The cubic root of 138042486 is about 516.8179518593.

It can be divided in two parts, 13804 and 2486, that added together give a triangular number (16290 = T₁₈₀).

The spelling of 138042486 in words is "one hundred thirty-eight million, forty-two thousand, four hundred eighty-six".