138905296 has 40 divisors (see below), whose sum is σ = 282426368. Its totient is φ = 66096000.

The previous prime is 138905281. The next prime is 138905339. The reversal of 138905296 is 692509831.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 27961 + ... + 32551.

Almost surely, 2^138905296 is an apocalyptic number.

138905296 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 138905296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141213184).

138905296 is an abundant number, since it is smaller than the sum of its proper divisors (143521072).

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

138905296 is a wasteful number, since it uses less digits than its factorization.

138905296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4691 (or 4685 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 138905296 is about 11785.8090939910. The cubic root of 138905296 is about 517.8924758063.

The spelling of 138905296 in words is "one hundred thirty-eight million, nine hundred five thousand, two hundred ninety-six".