8978394452842 has 4 divisors (see below), whose sum is σ = 13467591679266. Its totient is φ = 4489197226420.

The previous prime is 8978394452831. The next prime is 8978394452843. The reversal of 8978394452842 is 2482544938798.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8384956871041 + 593437581801 = 2895679^2 + 770349^2 .

It is a super-2 number, since 2×8978394452842² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (8978394452843) 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 as a sum of consecutive naturals, namely, 2244598613209 + ... + 2244598613212.

Almost surely, 2^{8978394452842} is an apocalyptic number.

8978394452842 is a deficient number, since it is larger than the sum of its proper divisors (4489197226424).

8978394452842 is a wasteful number, since it uses less digits than its factorization.

8978394452842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4489197226423.

The product of its digits is 1114767360, while the sum is 73.

The spelling of 8978394452842 in words is "eight trillion, nine hundred seventy-eight billion, three hundred ninety-four million, four hundred fifty-two thousand, eight hundred forty-two".