139728069 has 24 divisors (see below), whose sum is σ = 217777560. Its totient is φ = 85819392.

The previous prime is 139728047. The next prime is 139728079. The reversal of 139728069 is 960827931.

It can be written as a sum of positive squares in 4 ways, for example, as 1077444 + 138650625 = 1038^2 + 11775^2 .

It is not a de Polignac number, because 139728069 - 2⁵ = 139728037 is a prime.

It is a super-2 number, since 2×139728069² = 39047866532937522, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139728019) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 89197 + ... + 90749.

It is an arithmetic number, because the mean of its divisors is an integer number (9074065).

Almost surely, 2^139728069 is an apocalyptic number.

It is an amenable number.

139728069 is a deficient number, since it is larger than the sum of its proper divisors (78049491).

139728069 is a wasteful number, since it uses less digits than its factorization.

139728069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2341 (or 2338 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 139728069 is about 11820.6627986759. The cubic root of 139728069 is about 518.9130017785.

The spelling of 139728069 in words is "one hundred thirty-nine million, seven hundred twenty-eight thousand, sixty-nine".