396389402978 has 8 divisors (see below), whose sum is σ = 595126116972. Its totient is φ = 198014030656.

The previous prime is 396389402971. The next prime is 396389402989. The reversal of 396389402978 is 879204983693.

It can be written as a sum of positive squares in 2 ways, for example, as 371547545209 + 24841857769 = 609547^2 + 157613^2 .

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

It is not an unprimeable number, because it can be changed into a prime (396389402971) by changing a digit.

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, 90332675 + ... + 90337062.

Almost surely, 2^396389402978 is an apocalyptic number.

396389402978 is a deficient number, since it is larger than the sum of its proper divisors (198736713994).

396389402978 is a wasteful number, since it uses less digits than its factorization.

396389402978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180670836.

The product of its (nonzero) digits is 141087744, while the sum is 68.

The spelling of 396389402978 in words is "three hundred ninety-six billion, three hundred eighty-nine million, four hundred two thousand, nine hundred seventy-eight".