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400220 = 22520011
BaseRepresentation
bin1100001101101011100
3202022222222
41201231130
5100301340
612324512
73254552
oct1415534
9668888
10400220
11253767
12173738
13110222
14a5bd2
157d8b5
hex61b5c

400220 has 12 divisors (see below), whose sum is σ = 840504. Its totient is φ = 160080.

The previous prime is 400217. The next prime is 400237. The reversal of 400220 is 22004.

400220 is a modest number, since divided by 220 gives 40 as remainder.

It is a plaindrome in base 9.

It is a zygodrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 400198 and 400207.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9986 + ... + 10025.

It is an arithmetic number, because the mean of its divisors is an integer number (70042).

2400220 is an apocalyptic number.

It is an amenable number.

400220 is an abundant number, since it is smaller than the sum of its proper divisors (440284).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

400220 is a wasteful number, since it uses less digits than its factorization.

400220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20020 (or 20018 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 8.

The square root of 400220 is about 632.6294333968. The cubic root of 400220 is about 73.6941356126.

Adding to 400220 its reverse (22004), we get a palindrome (422224).

The spelling of 400220 in words is "four hundred thousand, two hundred twenty", and thus it is an iban number.

Divisors: 1 2 4 5 10 20 20011 40022 80044 100055 200110 400220