40309313 has 4 divisors (see below), whose sum is σ = 43973808. Its totient is φ = 36644820.

The previous prime is 40309301. The next prime is 40309319. The reversal of 40309313 is 31390304.

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 40309313 - 2¹² = 40305217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40309319) 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, 1832231 + ... + 1832252.

It is an arithmetic number, because the mean of its divisors is an integer number (10993452).

Almost surely, 2^40309313 is an apocalyptic number.

It is an amenable number.

40309313 is a deficient number, since it is larger than the sum of its proper divisors (3664495).

40309313 is a wasteful number, since it uses less digits than its factorization.

40309313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3664494.

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

The square root of 40309313 is about 6348.9615686347. The cubic root of 40309313 is about 342.8744564587.

Adding to 40309313 its reverse (31390304), we get a palindrome (71699617).

The spelling of 40309313 in words is "forty million, three hundred nine thousand, three hundred thirteen".