1978805713 has 8 divisors (see below), whose sum is σ = 2093924736. Its totient is φ = 1866110400.

The previous prime is 1978805707. The next prime is 1978805737. The reversal of 1978805713 is 3175088791.

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

It is a cyclic number.

It is not a de Polignac number, because 1978805713 - 2²⁵ = 1945251281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978805743) 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, 604248 + ... + 607513.

It is an arithmetic number, because the mean of its divisors is an integer number (261740592).

Almost surely, 2^1978805713 is an apocalyptic number.

It is an amenable number.

1978805713 is a deficient number, since it is larger than the sum of its proper divisors (115119023).

1978805713 is a wasteful number, since it uses less digits than its factorization.

1978805713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1211855.

The product of its (nonzero) digits is 423360, while the sum is 49.

The square root of 1978805713 is about 44483.7690961546. The cubic root of 1978805713 is about 1255.4547143559.

The spelling of 1978805713 in words is "one billion, nine hundred seventy-eight million, eight hundred five thousand, seven hundred thirteen".