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7445 = 51489
BaseRepresentation
bin1110100010101
3101012202
41310111
5214240
654245
730464
oct16425
911182
107445
115659
124385
133509
1429db
152315
hex1d15

7445 has 4 divisors (see below), whose sum is σ = 8940. Its totient is φ = 5952.

The previous prime is 7433. The next prime is 7451. The reversal of 7445 is 5447.

7445 is nontrivially palindromic in base 6.

7445 is digitally balanced in base 3, 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, and also an emirpimes, since its reverse is a distinct semiprime: 5447 = 13419.

It can be written as a sum of positive squares in 2 ways, for example, as 2116 + 5329 = 46^2 + 73^2 .

It is a cyclic number.

It is not a de Polignac number, because 7445 - 210 = 6421 is a prime.

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 7445.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 740 + ... + 749.

It is an arithmetic number, because the mean of its divisors is an integer number (2235).

27445 is an apocalyptic number.

It is an amenable number.

7445 is a deficient number, since it is larger than the sum of its proper divisors (1495).

7445 is a wasteful number, since it uses less digits than its factorization.

7445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1494.

The product of its digits is 560, while the sum is 20.

The square root of 7445 is about 86.2844134244. The cubic root of 7445 is about 19.5263723820.

The spelling of 7445 in words is "seven thousand, four hundred forty-five".

Divisors: 1 5 1489 7445