397973343091 has 4 divisors (see below), whose sum is σ = 397981479384. Its totient is φ = 397965206800.

The previous prime is 397973343049. The next prime is 397973343109. The reversal of 397973343091 is 190343379793.

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

It is a cyclic number.

It is not a de Polignac number, because 397973343091 - 2⁹ = 397973342579 is a prime.

It is a super-2 number, since 2×397973343091² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (397973343011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3994330 + ... + 4092751.

It is an arithmetic number, because the mean of its divisors is an integer number (99495369846).

Almost surely, 2^397973343091 is an apocalyptic number.

397973343091 is a deficient number, since it is larger than the sum of its proper divisors (8136293).

397973343091 is an equidigital number, since it uses as much as digits as its factorization.

397973343091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8136292.

The product of its (nonzero) digits is 11573604, while the sum is 58.

The spelling of 397973343091 in words is "three hundred ninety-seven billion, nine hundred seventy-three million, three hundred forty-three thousand, ninety-one".