397415281 has 2 divisors, whose sum is σ = 397415282. Its totient is φ = 397415280.

The previous prime is 397415279. The next prime is 397415351. The reversal of 397415281 is 182514793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 297735025 + 99680256 = 17255^2 + 9984^2 .

It is an emirp because it is prime and its reverse (182514793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397415281 - 2¹ = 397415279 is a prime.

It is a super-2 number, since 2×397415281² = 315877811144617922, which contains 22 as substring.

Together with 397415279, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (397415201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198707640 + 198707641.

It is an arithmetic number, because the mean of its divisors is an integer number (198707641).

Almost surely, 2^397415281 is an apocalyptic number.

It is an amenable number.

397415281 is a deficient number, since it is larger than the sum of its proper divisors (1).

397415281 is an equidigital number, since it uses as much as digits as its factorization.

397415281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 60480, while the sum is 40.

The square root of 397415281 is about 19935.2772993004. The cubic root of 397415281 is about 735.2158380105.

The spelling of 397415281 in words is "three hundred ninety-seven million, four hundred fifteen thousand, two hundred eighty-one".