397986497 has 2 divisors, whose sum is σ = 397986498. Its totient is φ = 397986496.

The previous prime is 397986469. The next prime is 397986557. The reversal of 397986497 is 794689793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 238115761 + 159870736 = 15431^2 + 12644^2 .

It is an emirp because it is prime and its reverse (794689793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397986497 - 2⁸ = 397986241 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (397986397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198993248 + 198993249.

It is an arithmetic number, because the mean of its divisors is an integer number (198993249).

Almost surely, 2^397986497 is an apocalyptic number.

It is an amenable number.

397986497 is a deficient number, since it is larger than the sum of its proper divisors (1).

397986497 is an equidigital number, since it uses as much as digits as its factorization.

397986497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20575296, while the sum is 62.

The square root of 397986497 is about 19949.5989182740. The cubic root of 397986497 is about 735.5679180811.

The spelling of 397986497 in words is "three hundred ninety-seven million, nine hundred eighty-six thousand, four hundred ninety-seven".