904643 has 2 divisors, whose sum is σ = 904644. Its totient is φ = 904642.

The previous prime is 904637. The next prime is 904661. The reversal of 904643 is 346409.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 904643 - 2⁴ = 904627 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 13.

It is not a weakly prime, because it can be changed into another prime (904633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 452321 + 452322.

It is an arithmetic number, because the mean of its divisors is an integer number (452322).

2⁹⁰⁴⁶⁴³ is an apocalyptic number.

904643 is a deficient number, since it is larger than the sum of its proper divisors (1).

904643 is an equidigital number, since it uses as much as digits as its factorization.

904643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 904643 is about 951.1272259798. The cubic root of 904643 is about 96.7146821839.

The spelling of 904643 in words is "nine hundred four thousand, six hundred forty-three".