138943860 has 96 divisors (see below), whose sum is σ = 438165504. Its totient is φ = 32592000.

The previous prime is 138943859. The next prime is 138943877. The reversal of 138943860 is 68349831.

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 31 ways as a sum of consecutive naturals, for example, 17065 + ... + 23855.

It is an arithmetic number, because the mean of its divisors is an integer number (4564224).

Almost surely, 2^138943860 is an apocalyptic number.

138943860 is a gapful number since it is divisible by the number (10) 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 138943860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219082752).

138943860 is an abundant number, since it is smaller than the sum of its proper divisors (299221644).

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

138943860 is a wasteful number, since it uses less digits than its factorization.

138943860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6845 (or 6843 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 138943860 is about 11787.4450157784. The cubic root of 138943860 is about 517.9403985230.

The spelling of 138943860 in words is "one hundred thirty-eight million, nine hundred forty-three thousand, eight hundred sixty".