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2978 = 21489
BaseRepresentation
bin101110100010
311002022
4232202
543403
621442
711453
oct5642
94068
102978
112268
121882
131481
14112a
15d38
hexba2

2978 has 4 divisors (see below), whose sum is σ = 4470. Its totient is φ = 1488.

The previous prime is 2971. The next prime is 2999. The reversal of 2978 is 8792.

2978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2809 + 169 = 53^2 + 13^2 .

It is a plaindrome in base 11 and base 14.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (2971) by changing a digit.

2978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 743 + ... + 746.

2978 is a deficient number, since it is larger than the sum of its proper divisors (1492).

2978 is a wasteful number, since it uses less digits than its factorization.

2978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1491.

The product of its digits is 1008, while the sum is 26.

The square root of 2978 is about 54.5710545986. The cubic root of 2978 is about 14.3871541819.

The spelling of 2978 in words is "two thousand, nine hundred seventy-eight".

Divisors: 1 2 1489 2978