138471860 has 12 divisors (see below), whose sum is σ = 290790948. Its totient is φ = 55388736.

The previous prime is 138471833. The next prime is 138471869. The reversal of 138471860 is 68174831.

It can be written as a sum of positive squares in 2 ways, for example, as 55771024 + 82700836 = 7468^2 + 9094^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138471869) 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 3 ways as a sum of consecutive naturals, for example, 3461777 + ... + 3461816.

It is an arithmetic number, because the mean of its divisors is an integer number (24232579).

Almost surely, 2^138471860 is an apocalyptic number.

138471860 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138471860 is an abundant number, since it is smaller than the sum of its proper divisors (152319088).

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

138471860 is a wasteful number, since it uses less digits than its factorization.

138471860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6923602 (or 6923600 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 138471860 is about 11767.4066811681. The cubic root of 138471860 is about 517.3532423979.

The spelling of 138471860 in words is "one hundred thirty-eight million, four hundred seventy-one thousand, eight hundred sixty".