139531008 has 72 divisors (see below), whose sum is σ = 375384688. Its totient is φ = 46006272.

The previous prime is 139530991. The next prime is 139531013. The reversal of 139531008 is 800135931.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73560 + ... + 75432.

Almost surely, 2^139531008 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139531008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (187692344).

139531008 is an abundant number, since it is smaller than the sum of its proper divisors (235853680).

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

139531008 is an equidigital number, since it uses as much as digits as its factorization.

139531008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1989 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 30.

The square root of 139531008 is about 11812.3244113934. The cubic root of 139531008 is about 518.6689429068.

Adding to 139531008 its reverse (800135931), we get a palindrome (939666939).

The spelling of 139531008 in words is "one hundred thirty-nine million, five hundred thirty-one thousand, eight".