139986243 has 24 divisors (see below), whose sum is σ = 213857280. Its totient is φ = 87991920.

The previous prime is 139986239. The next prime is 139986251. The reversal of 139986243 is 342689931.

It is a happy number.

139986243 is a `hidden beast` number, since 13 + 9 + 9 + 8 + 624 + 3 = 666.

It is not a de Polignac number, because 139986243 - 2² = 139986239 is a prime.

It is a super-2 number, since 2×139986243² = 39192296458510098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139986263) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36298 + ... + 39968.

It is an arithmetic number, because the mean of its divisors is an integer number (8910720).

Almost surely, 2^139986243 is an apocalyptic number.

139986243 is a deficient number, since it is larger than the sum of its proper divisors (73871037).

139986243 is a wasteful number, since it uses less digits than its factorization.

139986243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3919 (or 3916 counting only the distinct ones).

The product of its digits is 279936, while the sum is 45.

The square root of 139986243 is about 11831.5782125632. The cubic root of 139986243 is about 519.2324017372.

The spelling of 139986243 in words is "one hundred thirty-nine million, nine hundred eighty-six thousand, two hundred forty-three".