1679649939 has 30 divisors (see below), whose sum is σ = 2739202356. Its totient is φ = 1017228240.

The previous prime is 1679649893. The next prime is 1679649949. The reversal of 1679649939 is 9399469761.

It is not a de Polignac number, because 1679649939 - 2¹¹ = 1679647891 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1679649949) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1222657 + ... + 1224029.

Almost surely, 2^1679649939 is an apocalyptic number.

1679649939 is a deficient number, since it is larger than the sum of its proper divisors (1059552417).

1679649939 is an frugal number, since it uses more digits than its factorization.

1679649939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2769 (or 1387 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 63.

The square root of 1679649939 is about 40983.5325344217. The cubic root of 1679649939 is about 1188.7018159574.

The spelling of 1679649939 in words is "one billion, six hundred seventy-nine million, six hundred forty-nine thousand, nine hundred thirty-nine".