40120013 has 4 divisors (see below), whose sum is σ = 40276380. Its totient is φ = 39963648.

The previous prime is 40120009. The next prime is 40120033. The reversal of 40120013 is 31002104.

It is a happy number.

40120013 is digitally balanced in base 2, 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.

It can be written as a sum of positive squares in 2 ways, for example, as 35200489 + 4919524 = 5933^2 + 2218^2 .

It is a cyclic number.

It is not a de Polignac number, because 40120013 - 2² = 40120009 is a prime.

It is a super-3 number, since 3×40120013³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40119976 and 40120003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40120033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77798 + ... + 78311.

It is an arithmetic number, because the mean of its divisors is an integer number (10069095).

Almost surely, 2^40120013 is an apocalyptic number.

It is an amenable number.

40120013 is a deficient number, since it is larger than the sum of its proper divisors (156367).

40120013 is a wasteful number, since it uses less digits than its factorization.

40120013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156366.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 40120013 is about 6334.0360750473. The cubic root of 40120013 is about 342.3368800739.

Adding to 40120013 its reverse (31002104), we get a palindrome (71122117).

The spelling of 40120013 in words is "forty million, one hundred twenty thousand, thirteen".