139986242 has 16 divisors (see below), whose sum is σ = 234397152. Its totient is φ = 62149920.

The previous prime is 139986239. The next prime is 139986251. The reversal of 139986242 is 242689931.

It is a super-2 number, since 2×139986242² = 39192295898565128, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 139986193 and 139986202.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73043 + ... + 74934.

It is an arithmetic number, because the mean of its divisors is an integer number (14649822).

Almost surely, 2^139986242 is an apocalyptic number.

139986242 is a deficient number, since it is larger than the sum of its proper divisors (94410910).

139986242 is a wasteful number, since it uses less digits than its factorization.

139986242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148033.

The product of its digits is 186624, while the sum is 44.

The square root of 139986242 is about 11831.5781703034. The cubic root of 139986242 is about 519.2324005008.

The spelling of 139986242 in words is "one hundred thirty-nine million, nine hundred eighty-six thousand, two hundred forty-two".