1447921042978 has 4 divisors (see below), whose sum is σ = 2171881564470. Its totient is φ = 723960521488.

The previous prime is 1447921042973. The next prime is 1447921042991. The reversal of 1447921042978 is 8792401297441.

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., 1021751007489 + 426170035489 = 1010817^2 + 652817^2 .

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1447921042973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361980260743 + ... + 361980260746.

Almost surely, 2^{1447921042978} is an apocalyptic number.

1447921042978 is a deficient number, since it is larger than the sum of its proper divisors (723960521492).

1447921042978 is an equidigital number, since it uses as much as digits as its factorization.

1447921042978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723960521491.

The product of its (nonzero) digits is 8128512, while the sum is 58.

The spelling of 1447921042978 in words is "one trillion, four hundred forty-seven billion, nine hundred twenty-one million, forty-two thousand, nine hundred seventy-eight".