137986638 has 8 divisors (see below), whose sum is σ = 275973288. Its totient is φ = 45995544.

The previous prime is 137986633. The next prime is 137986661. The reversal of 137986638 is 836689731.

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

137986638 is an admirable number.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (137986631) 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, 11498881 + ... + 11498892.

It is an arithmetic number, because the mean of its divisors is an integer number (34496661).

Almost surely, 2^137986638 is an apocalyptic number.

137986638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

137986638 is a wasteful number, since it uses less digits than its factorization.

137986638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22997778.

The product of its digits is 1306368, while the sum is 51.

The square root of 137986638 is about 11746.7713862150. The cubic root of 137986638 is about 516.7482459228.

The spelling of 137986638 in words is "one hundred thirty-seven million, nine hundred eighty-six thousand, six hundred thirty-eight".