1979589042 has 18 divisors (see below), whose sum is σ = 4289518623. Its totient is φ = 659800092.

The previous prime is 1979588993. The next prime is 1979589049. The reversal of 1979589042 is 2409859791.

1979589042 is a `hidden beast` number, since 19 + 7 + 9 + 589 + 0 + 42 = 666.

It can be written as a sum of positive squares in only one way, i.e., 989794521 + 989794521 = 31461^2 + 31461^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=31461.

It is a self number, because there is not a number n which added to its sum of digits gives 1979589042.

It is not an unprimeable number, because it can be changed into a prime (1979589049) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 183523 + ... + 194009.

Almost surely, 2^1979589042 is an apocalyptic number.

1979589042 is an abundant number, since it is smaller than the sum of its proper divisors (2309929581).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1979589042 is an frugal number, since it uses more digits than its factorization.

1979589042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20982 (or 10492 counting only the distinct ones).

The product of its (nonzero) digits is 1632960, while the sum is 54.

The square root of 1979589042 is about 44492.5728858199. The cubic root of 1979589042 is about 1255.6203537179.

The spelling of 1979589042 in words is "one billion, nine hundred seventy-nine million, five hundred eighty-nine thousand, forty-two".