40123613 has 4 divisors (see below), whose sum is σ = 40137180. Its totient is φ = 40110048.

The previous prime is 40123607. The next prime is 40123619. The reversal of 40123613 is 31632104.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (40123607) and next prime (40123619).

It can be written as a sum of positive squares in 2 ways, for example, as 27321529 + 12802084 = 5227^2 + 3578^2 .

It is a cyclic number.

It is not a de Polignac number, because 40123613 - 2¹⁴ = 40107229 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 (40123619) 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, 248 + ... + 8961.

It is an arithmetic number, because the mean of its divisors is an integer number (10034295).

Almost surely, 2^40123613 is an apocalyptic number.

It is an amenable number.

40123613 is a deficient number, since it is larger than the sum of its proper divisors (13567).

40123613 is an equidigital number, since it uses as much as digits as its factorization.

40123613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13566.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 40123613 is about 6334.3202476667. The cubic root of 40123613 is about 342.3471191526.

Adding to 40123613 its reverse (31632104), we get a palindrome (71755717).

The spelling of 40123613 in words is "forty million, one hundred twenty-three thousand, six hundred thirteen".