40020313 has 4 divisors (see below), whose sum is σ = 40192308. Its totient is φ = 39848320.

The previous prime is 40020307. The next prime is 40020317. The reversal of 40020313 is 31302004.

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 5774409 + 34245904 = 2403^2 + 5852^2 .

It is a cyclic number.

It is not a de Polignac number, because 40020313 - 2⁹ = 40019801 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40020293 and 40020302.

It is not an unprimeable number, because it can be changed into a prime (40020317) 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, 85648 + ... + 86113.

It is an arithmetic number, because the mean of its divisors is an integer number (10048077).

Almost surely, 2^40020313 is an apocalyptic number.

It is an amenable number.

40020313 is a deficient number, since it is larger than the sum of its proper divisors (171995).

40020313 is a wasteful number, since it uses less digits than its factorization.

40020313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171994.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 40020313 is about 6326.1610001643. The cubic root of 40020313 is about 342.0530707742.

Adding to 40020313 its reverse (31302004), we get a palindrome (71322317).

The spelling of 40020313 in words is "forty million, twenty thousand, three hundred thirteen".