40646665 has 8 divisors (see below), whose sum is σ = 49208328. Its totient is φ = 32229120.

The previous prime is 40646663. The next prime is 40646687. The reversal of 40646665 is 56664604.

It can be written as a sum of positive squares in 4 ways, for example, as 1408969 + 39237696 = 1187^2 + 6264^2 .

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

It is not a de Polignac number, because 40646665 - 2¹ = 40646663 is a prime.

It is a super-3 number, since 3×40646665³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40646663) 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, 35406 + ... + 36535.

It is an arithmetic number, because the mean of its divisors is an integer number (6151041).

Almost surely, 2^40646665 is an apocalyptic number.

It is an amenable number.

40646665 is a deficient number, since it is larger than the sum of its proper divisors (8561663).

40646665 is a wasteful number, since it uses less digits than its factorization.

40646665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72059.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 40646665 is about 6375.4737078903. The cubic root of 40646665 is about 343.8283153795.

The spelling of 40646665 in words is "forty million, six hundred forty-six thousand, six hundred sixty-five".