1979975647 has 8 divisors (see below), whose sum is σ = 2133386640. Its totient is φ = 1826722560.

The previous prime is 1979975639. The next prime is 1979975761. The reversal of 1979975647 is 7465799791.

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

It is not a de Polignac number, because 1979975647 - 2³ = 1979975639 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 (1979972647) 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, 12754 + ... + 64207.

It is an arithmetic number, because the mean of its divisors is an integer number (266673330).

Almost surely, 2^1979975647 is an apocalyptic number.

1979975647 is a deficient number, since it is larger than the sum of its proper divisors (153410993).

1979975647 is a wasteful number, since it uses less digits than its factorization.

1979975647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78953.

The product of its digits is 30005640, while the sum is 64.

The square root of 1979975647 is about 44496.9172752450. The cubic root of 1979975647 is about 1255.7020874345.

The spelling of 1979975647 in words is "one billion, nine hundred seventy-nine million, nine hundred seventy-five thousand, six hundred forty-seven".