138743740 has 24 divisors (see below), whose sum is σ = 292979232. Its totient is φ = 55189440.

The previous prime is 138743723. The next prime is 138743741. The reversal of 138743740 is 47347831.

It is a self number, because there is not a number n which added to its sum of digits gives 138743740.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138743741) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15544 + ... + 22783.

It is an arithmetic number, because the mean of its divisors is an integer number (12207468).

Almost surely, 2^138743740 is an apocalyptic number.

138743740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138743740 is an abundant number, since it is smaller than the sum of its proper divisors (154235492).

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

138743740 is a wasteful number, since it uses less digits than its factorization.

138743740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38517 (or 38515 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 37.

The square root of 138743740 is about 11778.9532641912. The cubic root of 138743740 is about 517.6916169056.

The spelling of 138743740 in words is "one hundred thirty-eight million, seven hundred forty-three thousand, seven hundred forty".