397873493 has 2 divisors, whose sum is σ = 397873494. Its totient is φ = 397873492.

The previous prime is 397873477. The next prime is 397873513. The reversal of 397873493 is 394378793.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377641489 + 20232004 = 19433^2 + 4498^2 .

It is an emirp because it is prime and its reverse (394378793) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 397873493 - 2⁴ = 397873477 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397873793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198936746 + 198936747.

It is an arithmetic number, because the mean of its divisors is an integer number (198936747).

Almost surely, 2^397873493 is an apocalyptic number.

It is an amenable number.

397873493 is a deficient number, since it is larger than the sum of its proper divisors (1).

397873493 is an equidigital number, since it uses as much as digits as its factorization.

397873493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3429216, while the sum is 53.

The square root of 397873493 is about 19946.7664798082. The cubic root of 397873493 is about 735.4982926155.

The spelling of 397873493 in words is "three hundred ninety-seven million, eight hundred seventy-three thousand, four hundred ninety-three".