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2478 = 23759

2478 has 16 divisors (see below), whose sum is σ = 5760. Its totient is φ = 696.

The previous prime is 2477. The next prime is 2503. The reversal of 2478 is 8742.

It is a happy number.

2478 is an esthetic number in base 3, because in such base its adjacent digits differ by 1.

It is a super-2 number, since 2×24782 = 12280968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a Curzon number.

It is a plaindrome in base 10, base 13 and base 16.

It is a nialpdrome in base 14.

It is a zygodrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13 + ... + 71.

It is an arithmetic number, because the mean of its divisors is an integer number (360).

It is a practical number, because each smaller number is the sum of distinct divisors of 2478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2880).

2478 is an abundant number, since it is smaller than the sum of its proper divisors (3282).

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

2478 is a wasteful number, since it uses less digits than its factorization.

2478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71.

The product of its digits is 448, while the sum is 21.

The square root of 2478 is about 49.7795138586. The cubic root of 2478 is about 13.5321592700.

Adding to 2478 its product of digits (448), we get a triangular number (2926 = T76).

The spelling of 2478 in words is "two thousand, four hundred seventy-eight".

Divisors: 1 2 3 6 7 14 21 42 59 118 177 354 413 826 1239 2478