863965978 has 8 divisors (see below), whose sum is σ = 1296075060. Its totient is φ = 431940960.

The previous prime is 863965943. The next prime is 863966003. The reversal of 863965978 is 879569368.

It can be written as a sum of positive squares in 2 ways, for example, as 846635409 + 17330569 = 29097^2 + 4163^2 .

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

It is a super-2 number, since 2×863965978² = 1492874422282992968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23758 + ... + 47878.

Almost surely, 2^863965978 is an apocalyptic number.

863965978 is a deficient number, since it is larger than the sum of its proper divisors (432109082).

863965978 is a wasteful number, since it uses less digits than its factorization.

863965978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42032.

The product of its digits is 19595520, while the sum is 61.

The square root of 863965978 is about 29393.2981817284. The cubic root of 863965978 is about 952.4281294986.

The spelling of 863965978 in words is "eight hundred sixty-three million, nine hundred sixty-five thousand, nine hundred seventy-eight".