139805626 has 16 divisors (see below), whose sum is σ = 214203528. Its totient is φ = 68411200.

The previous prime is 139805621. The next prime is 139805641. The reversal of 139805626 is 626508931.

It can be written as a sum of positive squares in 4 ways, for example, as 124211025 + 15594601 = 11145^2 + 3949^2 .

It is a super-2 number, since 2×139805626² = 39091226122503752, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (139805621) 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 7 ways as a sum of consecutive naturals, for example, 47436 + ... + 50296.

Almost surely, 2^139805626 is an apocalyptic number.

139805626 is a deficient number, since it is larger than the sum of its proper divisors (74397902).

139805626 is a wasteful number, since it uses less digits than its factorization.

139805626 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3377.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 139805626 is about 11823.9429125821. The cubic root of 139805626 is about 519.0089927323.

The spelling of 139805626 in words is "one hundred thirty-nine million, eight hundred five thousand, six hundred twenty-six".