1979894425 has 6 divisors (see below), whose sum is σ = 2455069118. Its totient is φ = 1583915520.

The previous prime is 1979894407. The next prime is 1979894437. The reversal of 1979894425 is 5244989791.

It can be written as a sum of positive squares in 3 ways, for example, as 214886281 + 1765008144 = 14659^2 + 42012^2 .

It is not a de Polignac number, because 1979894425 - 2¹⁵ = 1979861657 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1979894425.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39597864 + ... + 39597913.

Almost surely, 2^1979894425 is an apocalyptic number.

It is an amenable number.

1979894425 is a deficient number, since it is larger than the sum of its proper divisors (475174693).

1979894425 is an equidigital number, since it uses as much as digits as its factorization.

1979894425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79195787 (or 79195782 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 58.

The square root of 1979894425 is about 44496.0045959185. The cubic root of 1979894425 is about 1255.6849168480.

The spelling of 1979894425 in words is "one billion, nine hundred seventy-nine million, eight hundred ninety-four thousand, four hundred twenty-five".