1978618959 has 12 divisors (see below), whose sum is σ = 2927713152. Its totient is φ = 1286906400.

The previous prime is 1978618921. The next prime is 1978619003. The reversal of 1978618959 is 9598168791.

1978618959 is a `hidden beast` number, since 1 + 9 + 7 + 8 + 618 + 9 + 5 + 9 = 666.

It is not a de Polignac number, because 1978618959 - 2⁸ = 1978618703 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1978618896 and 1978618905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978618259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2680687 + ... + 2681424.

It is an arithmetic number, because the mean of its divisors is an integer number (243976096).

Almost surely, 2^1978618959 is an apocalyptic number.

1978618959 is a deficient number, since it is larger than the sum of its proper divisors (949094193).

1978618959 is a wasteful number, since it uses less digits than its factorization.

1978618959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5362158 (or 5362155 counting only the distinct ones).

The product of its digits is 9797760, while the sum is 63.

The square root of 1978618959 is about 44481.6699214407. The cubic root of 1978618959 is about 1255.4152177099.

The spelling of 1978618959 in words is "one billion, nine hundred seventy-eight million, six hundred eighteen thousand, nine hundred fifty-nine".