139228786 has 4 divisors (see below), whose sum is σ = 208843182. Its totient is φ = 69614392.

The previous prime is 139228783. The next prime is 139228801. The reversal of 139228786 is 687822931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 687822931 = 457 ⋅1505083.

It can be written as a sum of positive squares in only one way, i.e., 103408561 + 35820225 = 10169^2 + 5985^2 .

It is not an unprimeable number, because it can be changed into a prime (139228783) 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 as a sum of consecutive naturals, namely, 34807195 + ... + 34807198.

Almost surely, 2^139228786 is an apocalyptic number.

139228786 is a deficient number, since it is larger than the sum of its proper divisors (69614396).

139228786 is an equidigital number, since it uses as much as digits as its factorization.

139228786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69614395.

The product of its digits is 290304, while the sum is 46.

The square root of 139228786 is about 11799.5248209409. The cubic root of 139228786 is about 518.2941959148.

The spelling of 139228786 in words is "one hundred thirty-nine million, two hundred twenty-eight thousand, seven hundred eighty-six".