138543986 has 16 divisors (see below), whose sum is σ = 240174720. Its totient is φ = 58708320.

The previous prime is 138543983. The next prime is 138544009. The reversal of 138543986 is 689345831.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 138543986.

It is not an unprimeable number, because it can be changed into a prime (138543983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 54350 + ... + 56841.

It is an arithmetic number, because the mean of its divisors is an integer number (15010920).

Almost surely, 2^138543986 is an apocalyptic number.

138543986 is a deficient number, since it is larger than the sum of its proper divisors (101630734).

138543986 is a wasteful number, since it uses less digits than its factorization.

138543986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111289.

The product of its digits is 622080, while the sum is 47.

The square root of 138543986 is about 11770.4709336543. The cubic root of 138543986 is about 517.4430516032.

The spelling of 138543986 in words is "one hundred thirty-eight million, five hundred forty-three thousand, nine hundred eighty-six".