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421556 = 22105389

421556 has 6 divisors (see below), whose sum is σ = 737730. Its totient is φ = 210776.

The previous prime is 421517. The next prime is 421559. The reversal of 421556 is 655124.

421556 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 401956 + 19600 = 634^2 + 140^2 .

It is a super-2 number, since 2×4215562 = 355418922272, which contains 22 as substring.

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 421556.

It is not an unprimeable number, because it can be changed into a prime (421559) by changing a digit.

421556 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 52691 + ... + 52698.

It is an arithmetic number, because the mean of its divisors is an integer number (122955).

2421556 is an apocalyptic number.

It is an amenable number.

421556 is a deficient number, since it is larger than the sum of its proper divisors (316174).

421556 is a wasteful number, since it uses less digits than its factorization.

421556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105393 (or 105391 counting only the distinct ones).

The product of its digits is 1200, while the sum is 23.

The square root of 421556 is about 649.2734400851. The cubic root of 421556 is about 74.9810915296.

The spelling of 421556 in words is "four hundred twenty-one thousand, five hundred fifty-six".

Divisors: 1 2 4 105389 210778 421556