40313309 has 4 divisors (see below), whose sum is σ = 40393020. Its totient is φ = 40233600.

The previous prime is 40313281. The next prime is 40313327. The reversal of 40313309 is 90331304.

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 33605209 + 6708100 = 5797^2 + 2590^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40313309 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 (40313359) 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, 39092 + ... + 40109.

It is an arithmetic number, because the mean of its divisors is an integer number (10098255).

Almost surely, 2^40313309 is an apocalyptic number.

It is an amenable number.

40313309 is a deficient number, since it is larger than the sum of its proper divisors (79711).

40313309 is an equidigital number, since it uses as much as digits as its factorization.

40313309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79710.

The product of its (nonzero) digits is 972, while the sum is 23.

The square root of 40313309 is about 6349.2762579683. The cubic root of 40313309 is about 342.8857861900.

The spelling of 40313309 in words is "forty million, three hundred thirteen thousand, three hundred nine".