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220401 = 35907
BaseRepresentation
bin110101110011110001
3102012100000
4311303301
524023101
64420213
71605366
oct656361
9365300
10220401
11140655
12a7669
137941c
145a46d
1545486
hex35cf1

220401 has 12 divisors (see below), whose sum is σ = 330512. Its totient is φ = 146772.

The previous prime is 220399. The next prime is 220403. The reversal of 220401 is 104022.

It is an interprime number because it is at equal distance from previous prime (220399) and next prime (220403).

It is not a de Polignac number, because 220401 - 21 = 220399 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (220403) 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 in 11 ways as a sum of consecutive naturals, for example, 211 + ... + 696.

2220401 is an apocalyptic number.

It is an amenable number.

220401 is a deficient number, since it is larger than the sum of its proper divisors (110111).

220401 is an frugal number, since it uses more digits than its factorization.

220401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 922 (or 910 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 9.

The square root of 220401 is about 469.4688488068. The cubic root of 220401 is about 60.4047633043.

Adding to 220401 its reverse (104022), we get a palindrome (324423).

The spelling of 220401 in words is "two hundred twenty thousand, four hundred one", and thus it is an iban number.

Divisors: 1 3 9 27 81 243 907 2721 8163 24489 73467 220401