139709849 has 4 divisors (see below), whose sum is σ = 144527460. Its totient is φ = 134892240.

The previous prime is 139709827. The next prime is 139709879. The reversal of 139709849 is 948907931.

139709849 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 948907931 = 1483 ⋅639857.

It can be written as a sum of positive squares in 2 ways, for example, as 102414400 + 37295449 = 10120^2 + 6107^2 .

It is a cyclic number.

It is not a de Polignac number, because 139709849 - 2⁸ = 139709593 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139709797 and 139709806.

It is not an unprimeable number, because it can be changed into a prime (139709819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2408762 + ... + 2408819.

It is an arithmetic number, because the mean of its divisors is an integer number (36131865).

Almost surely, 2^139709849 is an apocalyptic number.

It is an amenable number.

139709849 is a deficient number, since it is larger than the sum of its proper divisors (4817611).

139709849 is an equidigital number, since it uses as much as digits as its factorization.

139709849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4817610.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 139709849 is about 11819.8920891859. The cubic root of 139709849 is about 518.8904460484.

The spelling of 139709849 in words is "one hundred thirty-nine million, seven hundred nine thousand, eight hundred forty-nine".