395421493 has 2 divisors, whose sum is σ = 395421494. Its totient is φ = 395421492.

The previous prime is 395421491. The next prime is 395421503. The reversal of 395421493 is 394124593.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 274465489 + 120956004 = 16567^2 + 10998^2 .

It is an emirp because it is prime and its reverse (394124593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 395421493 - 2¹ = 395421491 is a prime.

Together with 395421491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (395421491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197710746 + 197710747.

It is an arithmetic number, because the mean of its divisors is an integer number (197710747).

Almost surely, 2^395421493 is an apocalyptic number.

It is an amenable number.

395421493 is a deficient number, since it is larger than the sum of its proper divisors (1).

395421493 is an equidigital number, since it uses as much as digits as its factorization.

395421493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 116640, while the sum is 40.

The square root of 395421493 is about 19885.2078943118. The cubic root of 395421493 is about 733.9842776419.

The spelling of 395421493 in words is "three hundred ninety-five million, four hundred twenty-one thousand, four hundred ninety-three".