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7405 = 51481
BaseRepresentation
bin1110011101101
3101011021
41303231
5214110
654141
730406
oct16355
911137
107405
115622
124351
1334a8
1522da
hex1ced

7405 has 4 divisors (see below), whose sum is σ = 8892. Its totient is φ = 5920.

The previous prime is 7393. The next prime is 7411. The reversal of 7405 is 5047.

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 2916 + 4489 = 54^2 + 67^2 .

It is a de Polignac number, because none of the positive numbers 2k-7405 is a prime.

It is a Duffinian number.

7405 is a lucky number.

It is a plaindrome in base 9 and base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 736 + ... + 745.

It is an arithmetic number, because the mean of its divisors is an integer number (2223).

27405 is an apocalyptic number.

It is an amenable number.

7405 is a deficient number, since it is larger than the sum of its proper divisors (1487).

7405 is a wasteful number, since it uses less digits than its factorization.

7405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486.

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

The square root of 7405 is about 86.0523096727. The cubic root of 7405 is about 19.4913395687.

The spelling of 7405 in words is "seven thousand, four hundred five".

Divisors: 1 5 1481 7405