40613 has 4 divisors (see below), whose sum is σ = 43020.
Its totient is φ = 38208.
The previous prime is 40609. The next prime is 40627. The reversal of 40613 is 31604.
40613 = 1422 + 1432.
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 20449 + 20164 = 143^2 + 142^2
It is a cyclic number.
It is not a de Polignac number, because 40613 - 22 = 40609 is a prime.
It is a Duffinian number.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (40693) by changing a digit.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1178 + ... + 1211.
It is an arithmetic number, because the mean of its divisors is an integer number (10755).
240613 is an apocalyptic number.
40613 is the 143-rd centered square number.
It is an amenable number.
40613 is a deficient number, since it is larger than the sum of its proper divisors (2407).
40613 is a wasteful number, since it uses less digits than its factorization.
40613 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2406.
The product of its (nonzero) digits is 72, while the sum is 14.
The square root of 40613 is about 201.5266731726.
The cubic root of 40613 is about 34.3733365586.
Subtracting from 40613 its reverse (31604), we obtain a palindrome (9009).
The spelling of 40613 in words is "forty thousand, six hundred thirteen".