397838453 has 2 divisors, whose sum is σ = 397838454. Its totient is φ = 397838452.

The previous prime is 397838431. The next prime is 397838459. The reversal of 397838453 is 354838793.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 229280164 + 168558289 = 15142^2 + 12983^2 .

It is an emirp because it is prime and its reverse (354838793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397838453 - 2⁸ = 397838197 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397838459) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198919226 + 198919227.

It is an arithmetic number, because the mean of its divisors is an integer number (198919227).

Almost surely, 2^397838453 is an apocalyptic number.

It is an amenable number.

397838453 is a deficient number, since it is larger than the sum of its proper divisors (1).

397838453 is an equidigital number, since it uses as much as digits as its factorization.

397838453 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 50.

The square root of 397838453 is about 19945.8881226182. Note that the first 3 decimals coincide. The cubic root of 397838453 is about 735.4767006462.

The spelling of 397838453 in words is "three hundred ninety-seven million, eight hundred thirty-eight thousand, four hundred fifty-three".