1978979583 has 16 divisors (see below), whose sum is σ = 3085719296. Its totient is φ = 1104546240.

The previous prime is 1978979567. The next prime is 1978979647. The reversal of 1978979583 is 3859798791.

It is not a de Polignac number, because 1978979583 - 2⁴ = 1978979567 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 (1978979533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1094878 + ... + 1096683.

It is an arithmetic number, because the mean of its divisors is an integer number (192857456).

Almost surely, 2^1978979583 is an apocalyptic number.

1978979583 is a deficient number, since it is larger than the sum of its proper divisors (1106739713).

1978979583 is a wasteful number, since it uses less digits than its factorization.

1978979583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2191614.

The product of its digits is 34292160, while the sum is 66.

The square root of 1978979583 is about 44485.7233615460. The cubic root of 1978979583 is about 1255.4914839280.

The spelling of 1978979583 in words is "one billion, nine hundred seventy-eight million, nine hundred seventy-nine thousand, five hundred eighty-three".