138181837 has 8 divisors (see below), whose sum is σ = 139790592. Its totient is φ = 136578000.

The previous prime is 138181829. The next prime is 138181853. The reversal of 138181837 is 738181831.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 138181837 - 2³ = 138181829 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 138181837.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138181037) 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, 103468 + ... + 104794.

It is an arithmetic number, because the mean of its divisors is an integer number (17473824).

Almost surely, 2^138181837 is an apocalyptic number.

It is an amenable number.

138181837 is a deficient number, since it is larger than the sum of its proper divisors (1608755).

138181837 is a wasteful number, since it uses less digits than its factorization.

138181837 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2459.

The product of its digits is 32256, while the sum is 40.

The square root of 138181837 is about 11755.0770733330. The cubic root of 138181837 is about 516.9917990087.

The spelling of 138181837 in words is "one hundred thirty-eight million, one hundred eighty-one thousand, eight hundred thirty-seven".