138051280 has 20 divisors (see below), whose sum is σ = 320969412. Its totient is φ = 55220480.

The previous prime is 138051253. The next prime is 138051301. The reversal of 138051280 is 82150831.

138051280 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 26790976 + 111260304 = 5176^2 + 10548^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862741 + ... + 862900.

Almost surely, 2^138051280 is an apocalyptic number.

138051280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138051280 is an abundant number, since it is smaller than the sum of its proper divisors (182918132).

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

138051280 is a wasteful number, since it uses less digits than its factorization.

138051280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725654 (or 1725648 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 138051280 is about 11749.5225434909. The cubic root of 138051280 is about 516.8289262597.

The spelling of 138051280 in words is "one hundred thirty-eight million, fifty-one thousand, two hundred eighty".