397948487 has 2 divisors, whose sum is σ = 397948488. Its totient is φ = 397948486.

The previous prime is 397948403. The next prime is 397948489. The reversal of 397948487 is 784849793.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 397948487 - 2¹⁴ = 397932103 is a prime.

Together with 397948489, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397948489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198974243 + 198974244.

It is an arithmetic number, because the mean of its divisors is an integer number (198974244).

Almost surely, 2^397948487 is an apocalyptic number.

397948487 is a deficient number, since it is larger than the sum of its proper divisors (1).

397948487 is an equidigital number, since it uses as much as digits as its factorization.

397948487 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12192768, while the sum is 59.

The square root of 397948487 is about 19948.6462447957. The cubic root of 397948487 is about 735.5445003463.

The spelling of 397948487 in words is "three hundred ninety-seven million, nine hundred forty-eight thousand, four hundred eighty-seven".