397548881 has 2 divisors, whose sum is σ = 397548882. Its totient is φ = 397548880.

The previous prime is 397548863. The next prime is 397548887. The reversal of 397548881 is 188845793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 233478400 + 164070481 = 15280^2 + 12809^2 .

It is an emirp because it is prime and its reverse (188845793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397548881 - 2¹⁸ = 397286737 is a prime.

It is a super-2 number, since 2×397548881² = 316090225568704322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397548887) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198774440 + 198774441.

It is an arithmetic number, because the mean of its divisors is an integer number (198774441).

Almost surely, 2^397548881 is an apocalyptic number.

It is an amenable number.

397548881 is a deficient number, since it is larger than the sum of its proper divisors (1).

397548881 is an equidigital number, since it uses as much as digits as its factorization.

397548881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 53.

The square root of 397548881 is about 19938.6278615154. The cubic root of 397548881 is about 735.2982151744.

The spelling of 397548881 in words is "three hundred ninety-seven million, five hundred forty-eight thousand, eight hundred eighty-one".