1979904613 has 8 divisors (see below), whose sum is σ = 2014855128. Its totient is φ = 1945165824.

The previous prime is 1979904611. The next prime is 1979904631. The reversal of 1979904613 is 3164099791.

It can be written as a sum of positive squares in 4 ways, for example, as 1432016964 + 547887649 = 37842^2 + 23407^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1979904613 - 2¹ = 1979904611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1979904611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34006 + ... + 71527.

It is an arithmetic number, because the mean of its divisors is an integer number (251856891).

Almost surely, 2^1979904613 is an apocalyptic number.

It is an amenable number.

1979904613 is a deficient number, since it is larger than the sum of its proper divisors (34950515).

1979904613 is a wasteful number, since it uses less digits than its factorization.

1979904613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105863.

The product of its (nonzero) digits is 367416, while the sum is 49.

The square root of 1979904613 is about 44496.1190779600. The cubic root of 1979904613 is about 1255.6870706490.

The spelling of 1979904613 in words is "one billion, nine hundred seventy-nine million, nine hundred four thousand, six hundred thirteen".