40645709 has 8 divisors (see below), whose sum is σ = 44019360. Its totient is φ = 37307376.

The previous prime is 40645663. The next prime is 40645711. The reversal of 40645709 is 90754604.

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 40645709 - 2¹² = 40641613 is a prime.

It is a super-2 number, since 2×40645709² = 3304147320225362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40645729) 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, 6407 + ... + 11060.

It is an arithmetic number, because the mean of its divisors is an integer number (5502420).

Almost surely, 2^40645709 is an apocalyptic number.

It is an amenable number.

40645709 is a deficient number, since it is larger than the sum of its proper divisors (3373651).

40645709 is a wasteful number, since it uses less digits than its factorization.

40645709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17659.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 40645709 is about 6375.3987326284. The cubic root of 40645709 is about 343.8256197713.

The spelling of 40645709 in words is "forty million, six hundred forty-five thousand, seven hundred nine".