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2945 = 51931
BaseRepresentation
bin101110000001
311001002
4232001
543240
621345
711405
oct5601
94032
102945
112238
121855
131457
141105
15d15
hexb81

2945 has 8 divisors (see below), whose sum is σ = 3840. Its totient is φ = 2160.

The previous prime is 2939. The next prime is 2953. The reversal of 2945 is 5492.

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

It is not a de Polignac number, because 2945 - 28 = 2689 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 11 and base 13.

It is a nialpdrome in base 16.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80 + ... + 110.

It is an arithmetic number, because the mean of its divisors is an integer number (480).

It is a Proth number, since it is equal to 23 ⋅ 27 + 1 and 23 < 27.

22945 is an apocalyptic number.

It is an amenable number.

2945 is a deficient number, since it is larger than the sum of its proper divisors (895).

2945 is a wasteful number, since it uses less digits than its factorization.

2945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55.

The product of its digits is 360, while the sum is 20.

The square root of 2945 is about 54.2678542049. The cubic root of 2945 is about 14.3338140576. Note that the first 3 decimals are identical.

The spelling of 2945 in words is "two thousand, nine hundred forty-five".

Divisors: 1 5 19 31 95 155 589 2945