1630393 has 2 divisors, whose sum is σ = 1630394. Its totient is φ = 1630392.

The previous prime is 1630381. The next prime is 1630399. The reversal of 1630393 is 3930361.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1447209 + 183184 = 1203^2 + 428^2 .

It is an emirp because it is prime and its reverse (3930361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1630393 - 2⁵ = 1630361 is a prime.

1630393 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1630399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 815196 + 815197.

It is an arithmetic number, because the mean of its divisors is an integer number (815197).

2^1630393 is an apocalyptic number.

It is an amenable number.

1630393 is a deficient number, since it is larger than the sum of its proper divisors (1).

1630393 is an equidigital number, since it uses as much as digits as its factorization.

1630393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1458, while the sum is 25.

The square root of 1630393 is about 1276.8684348828. The cubic root of 1630393 is about 117.6966497257.

Subtracting 1630393 from its reverse (3930361), we obtain a cube (2299968 = 132³).

The spelling of 1630393 in words is "one million, six hundred thirty thousand, three hundred ninety-three".