904453993 has 2 divisors, whose sum is σ = 904453994. Its totient is φ = 904453992.

The previous prime is 904453981. The next prime is 904453997. The reversal of 904453993 is 399354409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 572740624 + 331713369 = 23932^2 + 18213^2 .

It is an emirp because it is prime and its reverse (399354409) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-904453993 is a prime.

It is not a weakly prime, because it can be changed into another prime (904453997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452226996 + 452226997.

It is an arithmetic number, because the mean of its divisors is an integer number (452226997).

Almost surely, 2^904453993 is an apocalyptic number.

It is an amenable number.

904453993 is a deficient number, since it is larger than the sum of its proper divisors (1).

904453993 is an equidigital number, since it uses as much as digits as its factorization.

904453993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 524880, while the sum is 46.

The square root of 904453993 is about 30074.1416003849. The cubic root of 904453993 is about 967.0794618416.

The spelling of 904453993 in words is "nine hundred four million, four hundred fifty-three thousand, nine hundred ninety-three".