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2220001 = 7833821
BaseRepresentation
bin1000011101111111100001
311011210021021
420131333201
51032020001
6115325441
724604210
oct10357741
94153237
102220001
111286a13
128b0881
135c9614
1441b077
152dcba1
hex21dfe1

2220001 has 8 divisors (see below), whose sum is σ = 2568384. Its totient is φ = 1879440.

The previous prime is 2219999. The next prime is 2220007. The reversal of 2220001 is 1000222.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2220001 - 21 = 2219999 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is not an unprimeable number, because it can be changed into a prime (2220007) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1330 + ... + 2491.

It is an arithmetic number, because the mean of its divisors is an integer number (321048).

22220001 is an apocalyptic number.

It is an amenable number.

2220001 is a deficient number, since it is larger than the sum of its proper divisors (348383).

2220001 is an equidigital number, since it uses as much as digits as its factorization.

2220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3911.

The product of its (nonzero) digits is 8, while the sum is 7.

The square root of 2220001 is about 1489.9667781531. The cubic root of 2220001 is about 130.4520945894.

Adding to 2220001 its reverse (1000222), we get a palindrome (3220223).

The spelling of 2220001 in words is "two million, two hundred twenty thousand, one".

Divisors: 1 7 83 581 3821 26747 317143 2220001