138040284 has 48 divisors (see below), whose sum is σ = 326430720. Its totient is φ = 45399360.

The previous prime is 138040271. The next prime is 138040307. The reversal of 138040284 is 482040831.

138040284 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 15 ways as a sum of consecutive naturals, for example, 524737 + ... + 524999.

It is an arithmetic number, because the mean of its divisors is an integer number (6800640).

Almost surely, 2^138040284 is an apocalyptic number.

It is an amenable number.

138040284 is an abundant number, since it is smaller than the sum of its proper divisors (188390436).

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

138040284 is a wasteful number, since it uses less digits than its factorization.

138040284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690 (or 688 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 138040284 is about 11749.0546002647. The cubic root of 138040284 is about 516.8152038184.

The spelling of 138040284 in words is "one hundred thirty-eight million, forty thousand, two hundred eighty-four".