397943941281 has 4 divisors (see below), whose sum is σ = 530591921712. Its totient is φ = 265295960852.

The previous prime is 397943941181. The next prime is 397943941301. The reversal of 397943941281 is 182149349793.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 182149349793 = 3 ⋅60716449931.

It is a cyclic number.

It is not a de Polignac number, because 397943941281 - 2¹⁴ = 397943924897 is a prime.

It is a super-2 number, since 2×397943941281² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (397943941081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66323990211 + ... + 66323990216.

It is an arithmetic number, because the mean of its divisors is an integer number (132647980428).

Almost surely, 2^397943941281 is an apocalyptic number.

It is an amenable number.

397943941281 is a deficient number, since it is larger than the sum of its proper divisors (132647980431).

397943941281 is a wasteful number, since it uses less digits than its factorization.

397943941281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132647980430.

The product of its digits is 11757312, while the sum is 60.

The spelling of 397943941281 in words is "three hundred ninety-seven billion, nine hundred forty-three million, nine hundred forty-one thousand, two hundred eighty-one".