494721 has 16 divisors (see below), whose sum is σ = 745920. Its totient is φ = 324000.

The previous prime is 494719. The next prime is 494723. The reversal of 494721 is 127494.

494721 = T₇₈ + T₇₉ + ... + T₁₅₀.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (494719) and next prime (494723).

It is not a de Polignac number, because 494721 - 2¹ = 494719 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 494721.

It is not an unprimeable number, because it can be changed into a prime (494723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1846 + ... + 2096.

It is an arithmetic number, because the mean of its divisors is an integer number (46620).

2⁴⁹⁴⁷²¹ is an apocalyptic number.

It is an amenable number.

494721 is a deficient number, since it is larger than the sum of its proper divisors (251199).

494721 is a wasteful number, since it uses less digits than its factorization.

494721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 327 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 494721 is about 703.3640593604. The cubic root of 494721 is about 79.0897340653.

The spelling of 494721 in words is "four hundred ninety-four thousand, seven hundred twenty-one".