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2156209 = 11211929
BaseRepresentation
bin1000001110011010110001
311001112202121
420032122301
51022444314
6114114241
724220216
oct10163261
94045677
102156209
111242aa0
1287b981
135a6583
14401b0d
152c8d24
hex20e6b1

2156209 has 8 divisors (see below), whose sum is σ = 2365920. Its totient is φ = 1948800.

The previous prime is 2156207. The next prime is 2156221. The reversal of 2156209 is 9026512.

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 2156209 - 21 = 2156207 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2156207) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1857 + ... + 2785.

It is an arithmetic number, because the mean of its divisors is an integer number (295740).

22156209 is an apocalyptic number.

2156209 is the 929-th heptagonal number.

It is an amenable number.

2156209 is a deficient number, since it is larger than the sum of its proper divisors (209711).

2156209 is a wasteful number, since it uses less digits than its factorization.

2156209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1151.

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 2156209 is about 1468.4035548854. The cubic root of 2156209 is about 129.1904124687.

The spelling of 2156209 in words is "two million, one hundred fifty-six thousand, two hundred nine".

Divisors: 1 11 211 929 2321 10219 196019 2156209