397740533 has 2 divisors, whose sum is σ = 397740534. Its totient is φ = 397740532.

The previous prime is 397740529. The next prime is 397740559. The reversal of 397740533 is 335047793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 296597284 + 101143249 = 17222^2 + 10057^2 .

It is a cyclic number.

It is not a de Polignac number, because 397740533 - 2² = 397740529 is a prime.

It is a super-2 number, since 2×397740533² = 316395063182248178, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (397740593) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198870266 + 198870267.

It is an arithmetic number, because the mean of its divisors is an integer number (198870267).

Almost surely, 2^397740533 is an apocalyptic number.

It is an amenable number.

397740533 is a deficient number, since it is larger than the sum of its proper divisors (1).

397740533 is an equidigital number, since it uses as much as digits as its factorization.

397740533 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 238140, while the sum is 41.

The square root of 397740533 is about 19943.4333302970. The cubic root of 397740533 is about 735.4163547215.

The spelling of 397740533 in words is "three hundred ninety-seven million, seven hundred forty thousand, five hundred thirty-three".