1669408739 has 2 divisors, whose sum is σ = 1669408740. Its totient is φ = 1669408738.

The previous prime is 1669408691. The next prime is 1669408753. The reversal of 1669408739 is 9378049661.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1669408739 - 2²⁰ = 1668360163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1669408759) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834704369 + 834704370.

It is an arithmetic number, because the mean of its divisors is an integer number (834704370).

Almost surely, 2^1669408739 is an apocalyptic number.

1669408739 is a deficient number, since it is larger than the sum of its proper divisors (1).

1669408739 is an equidigital number, since it uses as much as digits as its factorization.

1669408739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 1669408739 is about 40858.3986347972. The cubic root of 1669408739 is about 1186.2809624819.

The spelling of 1669408739 in words is "one billion, six hundred sixty-nine million, four hundred eight thousand, seven hundred thirty-nine".