139999986 has 48 divisors (see below), whose sum is σ = 348192000. Its totient is φ = 39824064.

The previous prime is 139999973. The next prime is 139999991. The reversal of 139999986 is 689999931.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 27790 + ... + 32438.

It is an arithmetic number, because the mean of its divisors is an integer number (7254000).

Almost surely, 2^139999986 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139999986, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174096000).

139999986 is an abundant number, since it is smaller than the sum of its proper divisors (208192014).

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

139999986 is a wasteful number, since it uses less digits than its factorization.

139999986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4903 (or 4900 counting only the distinct ones).

The product of its digits is 8503056, while the sum is 63.

The square root of 139999986 is about 11832.1589745912. The cubic root of 139999986 is about 519.2493928768.

139999986 divided by its sum of digits (63) gives a palindrome (2222222).

Subtracting 139999986 from its reverse (689999931), we obtain a palindrome (549999945).

It can be divided in two parts, 13 and 9999986, that added together give a palindrome (9999999).

The spelling of 139999986 in words is "one hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-six".