494639 has 2 divisors, whose sum is σ = 494640. Its totient is φ = 494638.

The previous prime is 494621. The next prime is 494647. The reversal of 494639 is 936494.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 494639 - 2⁸ = 494383 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 494599 and 494608.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (494609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247319 + 247320.

It is an arithmetic number, because the mean of its divisors is an integer number (247320).

2⁴⁹⁴⁶³⁹ is an apocalyptic number.

494639 is a deficient number, since it is larger than the sum of its proper divisors (1).

494639 is an equidigital number, since it uses as much as digits as its factorization.

494639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 35.

The square root of 494639 is about 703.3057656525. The cubic root of 494639 is about 79.0853641164.

The spelling of 494639 in words is "four hundred ninety-four thousand, six hundred thirty-nine".