40020013 has 4 divisors (see below), whose sum is σ = 43658208. Its totient is φ = 36381820.

The previous prime is 40020011. The next prime is 40020017. The reversal of 40020013 is 31002004.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40020013 - 2¹ = 40020011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40020011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1819081 + ... + 1819102.

It is an arithmetic number, because the mean of its divisors is an integer number (10914552).

Almost surely, 2^40020013 is an apocalyptic number.

It is an amenable number.

40020013 is a deficient number, since it is larger than the sum of its proper divisors (3638195).

40020013 is a wasteful number, since it uses less digits than its factorization.

40020013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3638194.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 40020013 is about 6326.1372890572. The cubic root of 40020013 is about 342.0522160735.

Adding to 40020013 its reverse (31002004), we get a palindrome (71022017).

Subtracting from 40020013 its reverse (31002004), we obtain a square (9018009 = 3003²).

It can be divided in two parts, 4002001 and 3, that added together give a palindrome (4002004).

The spelling of 40020013 in words is "forty million, twenty thousand, thirteen".