1979289985 has 8 divisors (see below), whose sum is σ = 2375853480. Its totient is φ = 1582961664.

The previous prime is 1979289919. The next prime is 1979290003. The reversal of 1979289985 is 5899829791.

It can be written as a sum of positive squares in 4 ways, for example, as 143424576 + 1835865409 = 11976^2 + 42847^2 .

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 1979289985 - 2¹³ = 1979281793 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1979289985.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39712 + ... + 74401.

It is an arithmetic number, because the mean of its divisors is an integer number (296981685).

Almost surely, 2^1979289985 is an apocalyptic number.

It is an amenable number.

1979289985 is a deficient number, since it is larger than the sum of its proper divisors (396563495).

1979289985 is a wasteful number, since it uses less digits than its factorization.

1979289985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117587.

The product of its digits is 29393280, while the sum is 67.

The square root of 1979289985 is about 44489.2120069574. The cubic root of 1979289985 is about 1255.5571215758.

The spelling of 1979289985 in words is "one billion, nine hundred seventy-nine million, two hundred eighty-nine thousand, nine hundred eighty-five".