138568986 has 12 divisors (see below), whose sum is σ = 300232842. Its totient is φ = 46189656.

The previous prime is 138568979. The next prime is 138568987. The reversal of 138568986 is 689865831.

It can be written as a sum of positive squares in only one way, i.e., 134444025 + 4124961 = 11595^2 + 2031^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (138568987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3849121 + ... + 3849156.

Almost surely, 2^138568986 is an apocalyptic number.

138568986 is an abundant number, since it is smaller than the sum of its proper divisors (161663856).

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

138568986 is a wasteful number, since it uses less digits than its factorization.

138568986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7698285 (or 7698282 counting only the distinct ones).

The product of its digits is 2488320, while the sum is 54.

The square root of 138568986 is about 11771.5328653494. The cubic root of 138568986 is about 517.4741736044.

The spelling of 138568986 in words is "one hundred thirty-eight million, five hundred sixty-eight thousand, nine hundred eighty-six".