138925340 has 48 divisors (see below), whose sum is σ = 310346400. Its totient is φ = 52088832.

The previous prime is 138925307. The next prime is 138925379. The reversal of 138925340 is 43529831.

It is a self number, because there is not a number n which added to its sum of digits gives 138925340.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34976 + ... + 38744.

It is an arithmetic number, because the mean of its divisors is an integer number (6465550).

Almost surely, 2^138925340 is an apocalyptic number.

138925340 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 138925340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155173200).

138925340 is an abundant number, since it is smaller than the sum of its proper divisors (171421060).

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

138925340 is a wasteful number, since it uses less digits than its factorization.

138925340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3894 (or 3892 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 138925340 is about 11786.6594079917. The cubic root of 138925340 is about 517.9173851938.

The spelling of 138925340 in words is "one hundred thirty-eight million, nine hundred twenty-five thousand, three hundred forty".