397838447 has 4 divisors (see below), whose sum is σ = 397938840. Its totient is φ = 397738056.

The previous prime is 397838431. The next prime is 397838453. The reversal of 397838447 is 744838793.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 744838793 = 521 ⋅1429633.

It is a cyclic number.

It is not a de Polignac number, because 397838447 - 2⁴ = 397838431 is a prime.

It is a super-2 number, since 2×397838447² = 316550859822743618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (397838417) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43997 + ... + 52262.

It is an arithmetic number, because the mean of its divisors is an integer number (99484710).

Almost surely, 2^397838447 is an apocalyptic number.

397838447 is a deficient number, since it is larger than the sum of its proper divisors (100393).

397838447 is an equidigital number, since it uses as much as digits as its factorization.

397838447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100392.

The product of its digits is 4064256, while the sum is 53.

The square root of 397838447 is about 19945.8879722112. The cubic root of 397838447 is about 735.4766969488.

The spelling of 397838447 in words is "three hundred ninety-seven million, eight hundred thirty-eight thousand, four hundred forty-seven".