139996229 has 2 divisors, whose sum is σ = 139996230. Its totient is φ = 139996228.

The previous prime is 139996211. The next prime is 139996231. The reversal of 139996229 is 922699931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 135256900 + 4739329 = 11630^2 + 2177^2 .

It is a cyclic number.

It is not a de Polignac number, because 139996229 - 2²⁴ = 123219013 is a prime.

It is a super-4 number, since 4×139996229⁴ (a number of 34 digits) contains 4444 as substring.

It is a Sophie Germain prime.

Together with 139996231, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139996249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69998114 + 69998115.

It is an arithmetic number, because the mean of its divisors is an integer number (69998115).

Almost surely, 2^139996229 is an apocalyptic number.

It is an amenable number.

139996229 is a deficient number, since it is larger than the sum of its proper divisors (1).

139996229 is an equidigital number, since it uses as much as digits as its factorization.

139996229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 472392, while the sum is 50.

The square root of 139996229 is about 11832.0002112914. Note that the first 3 decimals coincide. The cubic root of 139996229 is about 519.2447480253.

The spelling of 139996229 in words is "one hundred thirty-nine million, nine hundred ninety-six thousand, two hundred twenty-nine".