139427669 has 2 divisors, whose sum is σ = 139427670. Its totient is φ = 139427668.

The previous prime is 139427663. The next prime is 139427711. The reversal of 139427669 is 966724931.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 107640625 + 31787044 = 10375^2 + 5638^2 .

It is an emirp because it is prime and its reverse (966724931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 139427669 - 2¹⁶ = 139362133 is a prime.

It is a super-2 number, since 2×139427669² = 38880149765547122, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (139427663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69713834 + 69713835.

It is an arithmetic number, because the mean of its divisors is an integer number (69713835).

Almost surely, 2^139427669 is an apocalyptic number.

It is an amenable number.

139427669 is a deficient number, since it is larger than the sum of its proper divisors (1).

139427669 is an equidigital number, since it uses as much as digits as its factorization.

139427669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 489888, while the sum is 47.

The square root of 139427669 is about 11807.9493986043. The cubic root of 139427669 is about 518.5408663162.

The spelling of 139427669 in words is "one hundred thirty-nine million, four hundred twenty-seven thousand, six hundred sixty-nine".