40309613 has 8 divisors (see below), whose sum is σ = 41867640. Its totient is φ = 38776320.

The previous prime is 40309589. The next prime is 40309637. The reversal of 40309613 is 31690304.

It is an interprime number because it is at equal distance from previous prime (40309589) and next prime (40309637).

It can be written as a sum of positive squares in 4 ways, for example, as 4153444 + 36156169 = 2038^2 + 6013^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40309613 - 2¹⁰ = 40308589 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 (40309663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2828 + ... + 9413.

It is an arithmetic number, because the mean of its divisors is an integer number (5233455).

Almost surely, 2^40309613 is an apocalyptic number.

It is an amenable number.

40309613 is a deficient number, since it is larger than the sum of its proper divisors (1558027).

40309613 is a wasteful number, since it uses less digits than its factorization.

40309613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12367.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 40309613 is about 6348.9851945016. The cubic root of 40309613 is about 342.8753070651.

Adding to 40309613 its reverse (31690304), we get a palindrome (71999917).

The spelling of 40309613 in words is "forty million, three hundred nine thousand, six hundred thirteen".