138551140 has 96 divisors (see below), whose sum is σ = 360702720. Its totient is φ = 43531776.

The previous prime is 138551137. The next prime is 138551143. The reversal of 138551140 is 41155831.

It is an interprime number because it is at equal distance from previous prime (138551137) and next prime (138551143).

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 138551099 and 138551108.

It is not an unprimeable number, because it can be changed into a prime (138551143) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 489439 + ... + 489721.

It is an arithmetic number, because the mean of its divisors is an integer number (3757320).

Almost surely, 2^138551140 is an apocalyptic number.

138551140 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 138551140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180351360).

138551140 is an abundant number, since it is smaller than the sum of its proper divisors (222151580).

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

138551140 is a wasteful number, since it uses less digits than its factorization.

138551140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 581 (or 579 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 138551140 is about 11770.7748258133. The cubic root of 138551140 is about 517.4519578574.

It can be divided in two parts, 1385 and 51140, that added together give a palindrome (52525).

The spelling of 138551140 in words is "one hundred thirty-eight million, five hundred fifty-one thousand, one hundred forty".