395426621 has 2 divisors, whose sum is σ = 395426622. Its totient is φ = 395426620.

The previous prime is 395426597. The next prime is 395426623. The reversal of 395426621 is 126624593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 393427225 + 1999396 = 19835^2 + 1414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-395426621 is a prime.

Together with 395426623, 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 (395426623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197713310 + 197713311.

It is an arithmetic number, because the mean of its divisors is an integer number (197713311).

Almost surely, 2^395426621 is an apocalyptic number.

It is an amenable number.

395426621 is a deficient number, since it is larger than the sum of its proper divisors (1).

395426621 is an equidigital number, since it uses as much as digits as its factorization.

395426621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77760, while the sum is 38.

The square root of 395426621 is about 19885.3368339588. The cubic root of 395426621 is about 733.9874505052.

The spelling of 395426621 in words is "three hundred ninety-five million, four hundred twenty-six thousand, six hundred twenty-one".