40715309 has 4 divisors (see below), whose sum is σ = 42858240. Its totient is φ = 38572380.

The previous prime is 40715303. The next prime is 40715321. The reversal of 40715309 is 90351704.

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 40715309 - 2⁸ = 40715053 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 (40715303) 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, 1071437 + ... + 1071474.

It is an arithmetic number, because the mean of its divisors is an integer number (10714560).

Almost surely, 2^40715309 is an apocalyptic number.

It is an amenable number.

40715309 is a deficient number, since it is larger than the sum of its proper divisors (2142931).

40715309 is a wasteful number, since it uses less digits than its factorization.

40715309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2142930.

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 40715309 is about 6380.8548800298. The cubic root of 40715309 is about 344.0217586967.

The spelling of 40715309 in words is "forty million, seven hundred fifteen thousand, three hundred nine".