434721 has 16 divisors (see below), whose sum is σ = 671744. Its totient is φ = 244944.

The previous prime is 434719. The next prime is 434743. The reversal of 434721 is 127434.

It is not a de Polignac number, because 434721 - 2¹ = 434719 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

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

It is a Duffinian number.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 434721.

It is not an unprimeable number, because it can be changed into a prime (434761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2586 + ... + 2748.

It is an arithmetic number, because the mean of its divisors is an integer number (41984).

2⁴³⁴⁷²¹ is an apocalyptic number.

434721 is the 381-st octagonal number.

It is an amenable number.

434721 is a deficient number, since it is larger than the sum of its proper divisors (237023).

434721 is a wasteful number, since it uses less digits than its factorization.

434721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300.

The product of its digits is 672, while the sum is 21.

The square root of 434721 is about 659.3337546342. Note that the first 3 decimals coincide. The cubic root of 434721 is about 75.7536459812.

The spelling of 434721 in words is "four hundred thirty-four thousand, seven hundred twenty-one".