1978429890247 has 8 divisors (see below), whose sum is σ = 2026917889920. Its totient is φ = 1929953015040.

The previous prime is 1978429890163. The next prime is 1978429890251. The reversal of 1978429890247 is 7420989248791.

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 1978429890247 - 2⁷ = 1978429890119 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1978429890347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2420503 + ... + 3133000.

It is an arithmetic number, because the mean of its divisors is an integer number (253364736240).

Almost surely, 2^{1978429890247} is an apocalyptic number.

1978429890247 is a deficient number, since it is larger than the sum of its proper divisors (48487999673).

1978429890247 is an equidigital number, since it uses as much as digits as its factorization.

1978429890247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5562233.

The product of its (nonzero) digits is 146313216, while the sum is 70.

The spelling of 1978429890247 in words is "one trillion, nine hundred seventy-eight billion, four hundred twenty-nine million, eight hundred ninety thousand, two hundred forty-seven".