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7045 = 51409
BaseRepresentation
bin1101110000101
3100122221
41232011
5211140
652341
726353
oct15605
910587
107045
115325
1240b1
13328c
1427d3
15214a
hex1b85

7045 has 4 divisors (see below), whose sum is σ = 8460. Its totient is φ = 5632.

The previous prime is 7043. The next prime is 7057. The reversal of 7045 is 5407.

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

It can be written as a sum of positive squares in 2 ways, for example, as 961 + 6084 = 31^2 + 78^2 .

It is a cyclic number.

It is not a de Polignac number, because 7045 - 21 = 7043 is a prime.

7045 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7043) 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 3 ways as a sum of consecutive naturals, for example, 700 + ... + 709.

It is an arithmetic number, because the mean of its divisors is an integer number (2115).

27045 is an apocalyptic number.

It is an amenable number.

7045 is a deficient number, since it is larger than the sum of its proper divisors (1415).

7045 is a wasteful number, since it uses less digits than its factorization.

7045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1414.

The product of its (nonzero) digits is 140, while the sum is 16.

The square root of 7045 is about 83.9344982710. The cubic root of 7045 is about 19.1702156839.

The spelling of 7045 in words is "seven thousand, forty-five".

Divisors: 1 5 1409 7045