139800006 has 40 divisors (see below), whose sum is σ = 315592200. Its totient is φ = 46252512.

The previous prime is 139799999. The next prime is 139800007. The reversal of 139800006 is 600008931.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139800007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 19045 + ... + 25343.

It is an arithmetic number, because the mean of its divisors is an integer number (7889805).

Almost surely, 2^139800006 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139800006, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157796100).

139800006 is an abundant number, since it is smaller than the sum of its proper divisors (175792194).

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

139800006 is a wasteful number, since it uses less digits than its factorization.

139800006 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6450 (or 6441 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 139800006 is about 11823.7052568135. The cubic root of 139800006 is about 519.0020381490.

Adding to 139800006 its reverse (600008931), we get a palindrome (739808937).

The spelling of 139800006 in words is "one hundred thirty-nine million, eight hundred thousand, six".