1670139709 has 4 divisors (see below), whose sum is σ = 1908731104. Its totient is φ = 1431548316.

The previous prime is 1670139703. The next prime is 1670139743. The reversal of 1670139709 is 9079310761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9079310761 = 109 ⋅83296429.

It is a cyclic number.

It is not a de Polignac number, because 1670139709 - 2³ = 1670139701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1670139701) 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 in 3 ways as a sum of consecutive naturals, for example, 119295687 + ... + 119295700.

It is an arithmetic number, because the mean of its divisors is an integer number (477182776).

Almost surely, 2^1670139709 is an apocalyptic number.

It is an amenable number.

1670139709 is a deficient number, since it is larger than the sum of its proper divisors (238591395).

1670139709 is an equidigital number, since it uses as much as digits as its factorization.

1670139709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238591394.

The product of its (nonzero) digits is 71442, while the sum is 43.

The square root of 1670139709 is about 40867.3428179518. The cubic root of 1670139709 is about 1186.4540795151.

The spelling of 1670139709 in words is "one billion, six hundred seventy million, one hundred thirty-nine thousand, seven hundred nine".