138501240 has 32 divisors (see below), whose sum is σ = 415504080. Its totient is φ = 36933632.

The previous prime is 138501229. The next prime is 138501257. The reversal of 138501240 is 42105831.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 138501240.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576969 + ... + 577208.

Almost surely, 2^138501240 is an apocalyptic number.

138501240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138501240 is an abundant number, since it is smaller than the sum of its proper divisors (277002840).

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

138501240 is a wasteful number, since it uses less digits than its factorization.

138501240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1154191 (or 1154187 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 138501240 is about 11768.6549783737. The cubic root of 138501240 is about 517.3898292861.

The spelling of 138501240 in words is "one hundred thirty-eight million, five hundred one thousand, two hundred forty".