138010640 has 20 divisors (see below), whose sum is σ = 320874924. Its totient is φ = 55204224.

The previous prime is 138010619. The next prime is 138010751. The reversal of 138010640 is 46010831.

It can be written as a sum of positive squares in 2 ways, for example, as 94556176 + 43454464 = 9724^2 + 6592^2 .

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

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, 862487 + ... + 862646.

Almost surely, 2^138010640 is an apocalyptic number.

138010640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138010640 is an abundant number, since it is smaller than the sum of its proper divisors (182864284).

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

138010640 is a wasteful number, since it uses less digits than its factorization.

138010640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725146 (or 1725140 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 138010640 is about 11747.7929842162. The cubic root of 138010640 is about 516.7782060033.

The spelling of 138010640 in words is "one hundred thirty-eight million, ten thousand, six hundred forty".