139708469 has 2 divisors, whose sum is σ = 139708470. Its totient is φ = 139708468.

The previous prime is 139708391. The next prime is 139708507. The reversal of 139708469 is 964807931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139594225 + 114244 = 11815^2 + 338^2 .

It is a cyclic number.

It is not a de Polignac number, because 139708469 - 2¹² = 139704373 is a prime.

It is a super-2 number, since 2×139708469² = 39036912620647922, 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 (139708169) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69854234 + 69854235.

It is an arithmetic number, because the mean of its divisors is an integer number (69854235).

Almost surely, 2^139708469 is an apocalyptic number.

It is an amenable number.

139708469 is a deficient number, since it is larger than the sum of its proper divisors (1).

139708469 is an equidigital number, since it uses as much as digits as its factorization.

139708469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 326592, while the sum is 47.

The square root of 139708469 is about 11819.8337128743. The cubic root of 139708469 is about 518.8887375762. Note that the first 3 decimals are identical.

The spelling of 139708469 in words is "one hundred thirty-nine million, seven hundred eight thousand, four hundred sixty-nine".