397785433 has 2 divisors, whose sum is σ = 397785434. Its totient is φ = 397785432.

The previous prime is 397785407. The next prime is 397785439. The reversal of 397785433 is 334587793.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 202009369 + 195776064 = 14213^2 + 13992^2 .

It is an emirp because it is prime and its reverse (334587793) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-397785433 is a prime.

It is a super-3 number, since 3×397785433³ (a number of 27 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (397785439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 198892716 + 198892717.

It is an arithmetic number, because the mean of its divisors is an integer number (198892717).

Almost surely, 2^397785433 is an apocalyptic number.

It is an amenable number.

397785433 is a deficient number, since it is larger than the sum of its proper divisors (1).

397785433 is an equidigital number, since it uses as much as digits as its factorization.

397785433 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1905120, while the sum is 49.

The square root of 397785433 is about 19944.5589823390. The cubic root of 397785433 is about 735.4440268253. Note that the first 3 decimals are identical.

The spelling of 397785433 in words is "three hundred ninety-seven million, seven hundred eighty-five thousand, four hundred thirty-three".