397648894399 has 2 divisors, whose sum is σ = 397648894400. Its totient is φ = 397648894398.

The previous prime is 397648894397. The next prime is 397648894451. The reversal of 397648894399 is 993498846793.

It is a weak prime.

It is an emirp because it is prime and its reverse (993498846793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397648894399 - 2¹ = 397648894397 is a prime.

Together with 397648894397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397648894397) 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 as a sum of consecutive naturals, namely, 198824447199 + 198824447200.

It is an arithmetic number, because the mean of its divisors is an integer number (198824447200).

Almost surely, 2^397648894399 is an apocalyptic number.

397648894399 is a deficient number, since it is larger than the sum of its proper divisors (1).

397648894399 is an equidigital number, since it uses as much as digits as its factorization.

397648894399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2539579392, while the sum is 79.

The spelling of 397648894399 in words is "three hundred ninety-seven billion, six hundred forty-eight million, eight hundred ninety-four thousand, three hundred ninety-nine".