138840480 has 144 divisors (see below), whose sum is σ = 491478624. Its totient is φ = 37013760.

The previous prime is 138840463. The next prime is 138840497. The reversal of 138840480 is 84048831.

138840480 is a `hidden beast` number, since 138 + 8 + 40 + 480 = 666.

It is an interprime number because it is at equal distance from previous prime (138840463) and next prime (138840497).

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37095 + ... + 40665.

It is an arithmetic number, because the mean of its divisors is an integer number (3413046).

Almost surely, 2^138840480 is an apocalyptic number.

138840480 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 138840480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245739312).

138840480 is an abundant number, since it is smaller than the sum of its proper divisors (352638144).

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

138840480 is an equidigital number, since it uses as much as digits as its factorization.

138840480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3601 (or 3581 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 36.

The square root of 138840480 is about 11783.0590255672. The cubic root of 138840480 is about 517.8119102647.

The spelling of 138840480 in words is "one hundred thirty-eight million, eight hundred forty thousand, four hundred eighty".