139240008 has 48 divisors (see below), whose sum is σ = 381015180. Its totient is φ = 45932544.

The previous prime is 139240001. The next prime is 139240009. The reversal of 139240008 is 800042931.

It can be written as a sum of positive squares in 2 ways, for example, as 133679844 + 5560164 = 11562^2 + 2358^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139240001) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2985 + ... + 16952.

Almost surely, 2^139240008 is an apocalyptic number.

139240008 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

139240008 is an abundant number, since it is smaller than the sum of its proper divisors (241775172).

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

139240008 is a wasteful number, since it uses less digits than its factorization.

139240008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20046 (or 20039 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 139240008 is about 11800.0003389830. Note that the first 3 decimals coincide. The cubic root of 139240008 is about 518.3081205764.

Adding to 139240008 its reverse (800042931), we get a palindrome (939282939).

The spelling of 139240008 in words is "one hundred thirty-nine million, two hundred forty thousand, eight".